g. Special welding processes C). The basic welding symbol consists of the reference line, about which the weld symbol and dimensions are located, and an arrow designating the location for the weld. Weld Symbol or Reference. The best way to clarify intent for back or backing welds is to provide. These standards have been through numerous revisions over the last few years; and the current. 1 /2. 62 size (thickness) of surfaces built up by welding. You failed to include a significant part of that clause 2. When back-gouging a weld joint, focus on the joint line,. Back gouging is a material removal process that is used to remove weld material that is located on the back side of a weld joint. Some of the common shop tools would be a framing square, level and tape. A full welding symbol is made of an arrow line, reference line, & welding symbol. Has anyone used these tapered ceramic backers?The owner is calling foul and wants all the "backgouged" welds to pass UT since the customers contention is that the weld symbol with "backgouged" should be a full pen weld and not have any root detectable reflectors. Back welds are backing welds- both are the same having the same weld symbol and hence not to be confused. The presence of ”R” means removable backing. Back notching. Field Weld Effective Throat M - Machine. Completed weld. Welding Symbols for Grooves Welded from Both Sides with Back-Gouging Only depth of preparation is required in the welding symbol GTSM 12 10 GTSM. Leader and arrow lines are used to locate points on the drawing to which a specific note, dimension, or welding symbol. Complete joint penetration is required. Simple Weld Symbol Question. See Det. Fillet Far Side. 1-2006) dealing with performance qualification says, "Note that qualification on joints with backing qualifies for production joints that are back gouged and welded from the second side. 3. 0 complete Welding on back gouged side after LPT / or MPTWeld symbols on drawings was originally published in 1982 based on BS 499 (British Standards Institution 1980), ISO 2553 (International Standards Organisation 1979) and ANSI/AWS A2. -it gives all the information necessary for preparing and/or welding joint. The welding symbol requirements for CJP and PJP welds belong stated in AWS D1. Weld SYMbol definitions BACK WELD, OTHER SIDE per AWS A2. Backing bar weld symbol according to AWS A2. Back gouge the opposite side to sound metal, back weld. So, Weld Symbol supplements a Welding Symbol to provide full details about the welding requirements. Weld repair the affected area. 80° to 90° 0° to 360°. then re-weld the gouge and add a contouring fillet weld under the bottom flange. s. 7. , with backing, and then have the qualification supplimented with an additional test where they are required. While the steel code allows for prequalified welding procedur es, this code does not. A back weld is when a weld is made in the groove of a joint and followed by a weld applied to the root side. MMA gouging differs because it requires special purpose electrodes with thick flux coatings to. 6. When the backing bar is removed, the weld root may be visually inspected to ensure that there is not lack of fusion or other weld faults. Any weld made one side without backing or back gouging is considered as a partial joint penetration weld per AWS D1. 3. -is an assembled symbol that combines multipile weld symbols into one. Weld Design Symbols - Free download as PDF File (. A material or device placed against the back side of the joint, or at both sides of a weld in ESW and EGW, to support and retain molten weld metal. to indicate the member to be prepared for the J- and bevel welds the arrow breaks toward that member. Especially Clause 6. 4 (American Welding Society-1979) standards. Minimum effective throat (E) as shown in LRFD Specification Table J2. Q. The back weld is the "last" weld deposited to "fill" the groove that results when the second side is back gouged to remove any unfused material or weld in the root that might be compromised. Fillet Weld Symbols. headerd. The orientation ot the two members in the joints may vary trom 1 350 to 1800 tor butt joints, or 450 to 1350 tor corner joints, or 450 to 900 tor T-joints. e. 2 and 4. With V-groove welds, the edges of both pieces are chamfered, either singly or doubly, to create the groove. Be able to interpret AWS welding symbols that include all of the information that could be used on them. This is mainly because of the many and varied possible welding conditions that can be obtained with semiautomatic welding variables most often used with aluminum and. 1350 • Cause: Poor welding technique • Prevention: Use proper techniques. its the same weld symbol you have shown. Unless it follows a different standard. A backing weld serves the same function as a backing bar. As in conventional MMA welding, the arc is formed between the tip of the electrode and the workpiece. Radius. Plug. The back weld is made after the groove weld, and the backing weld is made before the groove weld (see 6. For welding procedure qualification, some welding codes classify the use of backing as an essential variable (EN 15614-1) but others classify it as non-essential (ASME Section IX). arrow. false. 1 AWS A2. For nonsymmetrical double groove welds, the symbol needs to show the required. Add the reinforcing fillets when convenient. Back filling d. Means This Figure 10-25 Spacer. Additional Weld Symbols. ca. Change you use of "full depth partial penetration weld" to describe something that IS NOT a CJP. Answer the following statement true (T) or false (F). 414 x throat leg. The term "_____" indicates removal of weld material and base metal from the other side of a partially welded joint. 5. A direct splice between the two members is the better detail if you have welders with the ability to weld grooved joints. Therefore they must. , while Fig. Once again, there is little chance the welder can do what you specify due to limited access between the two ends of the wide flange beams. Weave beads: Weave beads are often used for welding thicker metals together. 2 Back Weld Symbol. 2 – Certification of Companies for Fusion Welding of Aluminum CSA W59. make it easier on your welder by performing the back gouging on the outside. So, Weld Symbol supplements a Welding Symbol to provide full details about the welding requirements. The material may. Welding Symbols: p. How are the dimensions for a fillet weld given? Out on the left side of the symbol before the vertical side 27. Inclined 6G—The pipe is fixed in a 45° inclined angle,. A "full depth partial penetration weld" is a PJP no matter what you choose to call it but calling it a "full penetration weld" is asking for trouble. 4 Code. The back weld symbol is placed on the side of the reference line opposite a groove weld symbol (Remember the difference. A type of weld that is triangular in shape and joins two surfaces at right angles to each other in a lap joint, T-joint, or corner joint. 25-2 Illustrations for a Double V-Groove with Back Gouge. Therefore, a note in the tail of the welding symbol may specify which type of weld is required or it may be specified in the legend. 2 useofsurfacingsymbol. W. Joint and Weld Designation Examples The lower cse letters, e. Single vee groove with grinding flush weld contour in arrow. nena sosnnnnnnnnnnneennnnseneeee od use of surfacing symbol. Back to Table of Contents. The welder moves the torch back and forth across the width of the metal being welded. in Trades & Technology. Moreover, this allows for the complete penetration and complete fusion of the welds from both sides. Here are some commonly used NDT symbols: Radiographic Testing (RT): This technique employs X-rays or gamma rays to inspect welds for internal flaws. e. It is a seam welding technique that uses rotating alloy wheel electrodes to create a. Most of the common weld types in the industry are used when the joint has two members joining together to create an intersection of 90 degrees. 4-79, Symbols for Weld - ing and Nondestructive Testing, Including Brazing and revised again in 1986 with the title,. Each welding procedure data sheet number should be unique so that the WPDS can be easily referenced on production schedules, work orders, shop drawings etc. 3, and given below for reference. 7. In addition, the weld toe of the tack weld or fillet weld on the beam flange would act as a stress concentration and a potential fracture initiation site. W. UNDERCUT. 05/25/2008 11:33 AM. AWS D1. 7. Height, contour, and method of contour are all types of information that can be added to the back or backing weld symbol. 1. 4 for guidance. 3 – Structural Welding Code – Sheet Steel AWS D1. or may not fuse into the joint. although both use the same welding symbol. Weld size (length of leg) Length of increments. symbols for surfacing 5. Determination of which type (backing weld vs. Back gouging and back welding to get good weld quality Less weld metal Higher edge preparation cost Tee Joint Full strength joint In a full strength joint, leg = 0. Decoding the Back Gouging Welding Symbol: A Comprehensive Guide Welding symbols are the language of the fabrication industry, guiding welders and inspectors alike on how. Symbol Convex R - Roll. The welding symbol without dimensions and with "CJP" in the tail designates a CJP weld as follows: The welding symbol without dimension and without CJP in the tail designates a weld that will develop the adjacent base metal strength in tension and shear A welding symbol. The weld may either be made from one side with steel backing or from both sides with back gouging. The weld symbol distinguishes between the two sides by using the arrow and the spaces above and below the reference line. b) To gauge weld size: (1. Two of the most common methods of gouging metal are plasma gouging and air carbon-arc gouging. A welding symbol is what you see on the fabrication drawing. Backing Welds and Back Welds Backing welds and back welds use the same weld symbol, which looks like an unshaded half circle. Process description. Weld Related. 1. In your case, you welded a joint from one side. Joint ELEMENTARY WELD SYMBOLS. Sequence 1 weld the all around arrow side bevel groove in the field 2 back gouge from ME MISC at Concordia UniversityBy jwright650 Date 01-31-2006 20:12. The welder moves the torch in a straight line along the length of the metal being welded. 1 Symbol application. 1, Structural Welding Code—Steel, is prepared by the AWS Structural Welding Committee. Up to 3/4" 100° Over 3/4" to 1 1/2" 100° Over 1 1/2" to 2 1/2" 150° Over 2 1/2" 225° WPS Description Double V Groove With Back Gouge Written By: Randy Dempsey, CWI/CWE, TT IV Signature: Backing is a material applied at the root of a weld joint to support and shield molten weld metal. Example 1 (top left side) in the below picture shows the welding symbol for single fare bevel weld. Neither orientation of reference nor location of the arrow. The symbol for the back and the backing weld is the same, but the information at the tail indicates the actual welding required. Followed by backgouge and weld on the (arrow side). Bevelling the plate edges allows access to all parts of the joint, enabling good fusion throughout the weld to be achieved. Back gouging can ensure 100% joint fusion at the root and remove discontinuities of the root pass. After welding we are doing Backgouging . L. c. a Fillet Weld, a bevel or square butt, etc. Although these processes are easier and more labor-efficient than conventional methods, such as using an oxy-acetylene torch or grinding, they can also come with. <---<"tack weld 4 places @ 90* apart". Convex. A spacer to hold. Download. A. Asbestos, a piece of metal, or other. Illustrations for a double bevel groove with back gouge. The area of the cut is small and, since the metal is. 2: “Omitting the depth of bevel and groove weld size dimensions from the welding symbol requires com-plete joint penetration only for single-groove welds and double-groove welds having symmetricalTack welds are small and temporary welds used to hold parts together before a final weld occurs. Visual inspection of joint preparation . Overhead 0° to 80° 0° to 125°. Hoses and Power Cables 195 Section 3 Cutting and Gouging 149 Gas Hoses 195 Power Cable 197 Chapter 7 Flame Cutting 151 Coolant System 197 Objectives 151 Coolant 197 Key Terms 151 Coolant Hoses 197 Introduction 152 Control Wire 198 Metals Cut by. 210° to 235°. P GB 50661-2011. specified, a tail is included as part of the welding symbol for inclusion of the. 4. 4-76, Symbols for Welding and Nondestructive Testing, was the first version of the combined documents and was prepared by the AWS Committee on Definitions and Symbols. Back gouging C. Design Part 4. The symbol for a CJP weld is quite simple – it’s a single bevel symbol (an inverted ‘V’) or a square groove symbol or any other weld type but clearly specifying CJP in the weld symbol tail section. The metal that is being welded on. Fillet weld-all- around symbol Note the fillet weld-all-around symbol. Also the weld size (E) applies individually to each groove. NOTE: Butt weld made aft er welding other side (b) Use of backing run or backing weld symbol to indicate single-run backing weld. Sketch a V-Grooved butt joint, and label all of the joint dimensions. Study Resources. back weld) is required based on the symbol alone cannot be made. 412007 BACK WELD, OTHER SIDE Ba. Good access at the root Back gouging and back welding to get good weld quality Less weld metal. When an insert is. groove depth for each side of the joint and include the required groove. 4. (120VAC), optional Control Modules (for programmable shape cutting or welding, straight-line cutting and/or welding, straightline gouging, programmable stitch welding, as well as weave capability), optional aluminum rails. Back Gouging The removal of weld and base metal by arc gouging or grinding from the other side of a partially welded joint to assure complete fusion and penetration upon subsequent welding from. 5. Expert Help. Whether the symbol refers to a back weld or a backing weld or run can be indicated in the AWS system by writing BACK WELD or. Back-gouge second side to sound weld metal and visually inspect back-gouge. Butt Joint – J groove. I side with the latter. No tail note on back v. In joints with thicknesses of 0. 2 extent, location, and orientation of surfaces built up by welding. back gouging. c. What is Back Gouging in Welding? Back gouging is a material removal process that is used to remove weld material that is located on the back side of a weld. Fillet Weld Symbols. So basically, the weld symbol is a part of the welding symbol. A Welding Symbol is partial without a Weld Symbol. 27 Throat and leg length dimensions given on the weld symbol for a fillet weld. , pipe welding, plate welding, box welding, -T-K-Y. the spacer material symbol modifies the shape of the groove weld symbol by the addition of a circle within the groove symbol. 1 which is common in North America. the spacer material symbol modifies the shape of the groove weld symbol by the addition of a circle within the groove symbol. Back gouging can ensure 100% joint fusion at the root and remove discontinuities of the root pass. Enhance the benefits of SAW process. The structure of the online seminar is similar to the traditional in-person CWI seminar, but is conducted in the form of interactive, two-hour online sessions hosted by an AWS. Back gouging c. Weld Design Symbols 01 - Free download as Powerpoint Presentation (. Back gouge. 1. For most welding processes, plates that are thicker than ---- may be grooved on both the inside and the outside of the joint. welded. Weld repair the affected area. ½ diameter, used to either make part or all of a circle. It’s safe to say tack welding is pretty important. welded. 1 Coderequires back-gouging on prequalified double sided joints to provide assurance of complete through-section fusion. Contact. But this is not the end. Each reference line could refer to a specific WPS; one for SMAW, the other for SAW. Air carbon arc cutting is also used when slightly ragged edges are not objectionable. The fact that the joint is considered to be PJP affects the design considerations. I believe I would have reversed the sequence by depositing a backing weld on the other side using GMAW, followed by a back gouging. Topic Sections / Section 156: Inland Empire / Weld Symbols By CWI-BRI Date 10-31-2018 16:52 Hey guys, does a square groove weld symbol with no size or depth designation automatically default to a CJP? it shows a square groove weld on arrow side but does not specify size, depth, opening, backing, back gouging or anything. Chemical back gouging, on the other hand, involves using a chemical agent to remove the weld metal and base metal. Clarification required how much depth back gouging is accepted. A welder qualification test, or WQT, is a test used to measure a welder’s ability to produce sound welds in accordance with specific standards. The welding symbol structure consists of a reference line, an arrow, and a tail. There are several orbital welding training schools in the USA. Further confusing the issue is that a backing weld differs from a back weld. In the ISO system, which uses metric units, weld dimensions can be written adjacent to the symbols. Back Gouging: The removal of weld and base metal by arc gouging or grinding from the other side of a partially welded joint to assure. Wetting Out. Read MoreThis allows it to gouge or cut a wide range of metals, including carbon steel, stainless steel, high-alloy wear plate, copper alloys, and cast irons. The removal of weld metal and base metal from the other side of a partially welded joint to assure complete penetration upon subsequent welding from that side. J. 7. 0 Back gouge / or grind/ from other side Method of achieving Full Penetration. ck '>---. Type 1: CJP groove weld (statically and cyclically loaded. Root Pass Welding . IMPLEMENTED ON. Weldment. Joints are combined with welds to make weld joints. for the purpose of supporting molten weld metal so as. ” “After non-fusible backing is removed, back-gouging to sound metal removes potential root flaws within the welded joint. Or in the case of square edges, not as much base plate on the second side would need to be removed by back gouging before sound weld metal was. txt) or view. DECEMBER 5, 2011. Part 3. 10. 8 Convention for back gouging after welding one side. An introduction into reading Welding Symbols. A groove (or butt) weld is a type of weld where parts are joined via a weld between a groove or gap (think of the groove joint discussed at the start). bar removal, back gouging, and re-welding requirements. About us. ” Today, rather than saying 60 cycles per second or simply 60 cycles, we say 60. Air gouging. Back gouging -. Design-related specifications, such as type, thickness, and length of weld, weld quality, surface treatment, filler material and testing specifications, can be indicated directly at the weld by means of the symbols. You can use a fillet weld symbol above or below the reference line or on both sides. 173 Location of Elements of a Welding Symbol Groove angle; included angle of Finish symbol countersink for plug welds Contour symbol Groove weld size Depth of bevel; size or strength for certain welds Specification, process, or Root opening; depth of filling F for plug and slot welds Length of weld Pitch (center-to-center R spacing) of welds Back or backing weld: The back or backing weld symbol shows a semicircle symbol (note that this is not filled with black/dark color). Back gouging to remove root defects Good weld quality Good access at the root Back gouging and back welding to get good weld quality Less weld metal Higher edge preparation cost In a full strength joint, leg = 0. WHY IS BACK GOUGING NEEDED?. in Trades. Determination of which type (backing weld vs. to present this information to help aid in gouging process design. This process can also remove the root pass metal if the properties of the metal are not desirable to the finished weld. 1. 2. F134 The first operation required by the above symbol is: a. Refers to the finished assembly when two or more pieces of material are joined by welding. The main differences are in regard to heat input and distortion. Back gouging _____ welds may be specified as performing a sealing function only, such as when fabricating tanks and other metal containers that must be. Although the back weld and a backing weld. 7. Opinion: Depth of the back gouge on the second side: 5/8 inch minimum. 235° to 360°. ˇˆ˙ˇ˝ ˛˚ ˘ ˇ ˆ ˙ ˘ ˇˇˆ. The Arrow Just as it sounds, the arrow is a line and arrowhead coming off one end of the reference line. Introducing too little heat, resulting in a “cold weld”. NCDOT MATERIALS & TESTS UNIT (STEEL SECTION) Title: March. Root Opening Finish Symbols. " And from AWS A2. One basic premise of a fillet weld is that the weld be completely fused to the root. The backing material supports and protects the root weld to promote full penetration of the weld metals. Yes the print shows splice plates where they terminated support angles at the toe of the main corner angles. This is a list of the various items that will be needed to build the weldment. true. 1, examines each component of the welding symbol reference line required arrow required tail basic weld symbol dimensions and. 1 Code alternative which permitted WPS qualification without the use of back gouging. ago. 5/16 * 1/2 - 1018. (120VAC), optional Control Modules (for programmable shape cutting or welding, straight-line cutting and/or welding, straightline gouging, programmable stitch welding, as well as weave capability), optional aluminum rails. Fillet Near Side. MULTIPLE CHOICE QUESTIONS. forward gouge. Back Gouging (Yes/ No, Method, Depth) Back gouging is the removal of weld metal and base metal from the weld root side of a welded joint toIn the ____-groove welds, only one of the two members is beveled. A Type 1 CJP weld is one that uses a backing strip or backing plate to guarantee complete fusion between both plates with the root backing. Can ensure 100% joint fusion at the root & can remove discontinuities of the root pass. 5. The back weld is made after the groove weld, and the backing weld is made before the groove weld (see 4. Back gouging is the smoothing, leveling, and re-applying of weld metal to the root of a joint, which is the area where the weld metal makes contact with the butt joint. Higher edge preparation cost Better for thickness > 40 mm. Back Gouging . The alternative approach replaced the back gouging operation with a unique root pass procedure that ensured a CJP groove weld. Remove all slag, spatter and weld discontinuities between passes. So in the sketches I attached the backing welds are nearest the reference line. 2 of Appendix D. 22west, I'd think Sketch 11 is applicable, and that the detail meets the requirement for an integral flange. Advanced Welding Symbols 171 M10_CORG3839_02_SE_C10. The welding symbol (see Fig. 3. The first layer of surface welding is often prone to defects such as cracking, poor penetration, and slag inclusion due to its fast cooling speed. with the BTC-P10-GF you can't gain access to the back side of. A full penetration weld is designated as “CJP” in the welding symbol tail section to specify that it is a full penetration welding joint as shown in the below figure. Thanks for watching an. When might you not have a weld symbol in the welding symbol? See Figures 10-18 and 10-19. Complete joint penetration is required. Field weld. Backfire. A3. Tom, Sorry but I agree with the designers. Spacer – This symbol indicates the type and the dimension of the spacer that is inserted between the welded pieces. An introduction into reading Welding Symbols. 5. In welding, the hot pass, root pass and capping pass are the three most important passes. 1 Distinction between weld symbol and welding symbol. Weld one side, i. (38' high) If they show full pen, I will be back gouging/grinding, but with the basic symbol they gave me, (just the double square groove) I did not plan. Hence, you can pick the one that suits your welding requirements. In some cases, weld backing may also eliminate the need to grind or. a Fillet Weld, a bevel or square butt, etc. The objective of Back gouging is to facilitate completeweld fusionfrom the root side back weld. 6. 4, “Applications of Back or Backing Weld Symbol”.