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TIG Welding guide GUIDE TO TIG WELDING Weld Tech

of weld metal to outside pipe wall It is recommended that alignment be verified by using “Hi Lo” gauges after has been fit up and tack welded When backing is shown as “Required” on the WPS the backing shall be backing ring or strip or other material shown above or it shall be weld metal deposited by anotherFusion welding 2 Why use welding 3 Arc welding processes 4 Welding terms 5 MIG/MAG welding 6 TIG welding 10 Plasma welding 17 Welding sheet 18 Welding plate 20 Welding pipes 22 Defects in welds 24 The right gas MIG/MAG welding 26 TIG welding 29 Welding data MIG/MAG welding 30 Flux cored electrodes 33 TIG welding 34 Oxy fuel gas cutting 37 Recommended Welding Wire Size Chart Multi pass welding or a beveled joint design may be required on material thickness 3/16" and greater depending on your welding machine& 39 s amperage capability In actual shop fabrication welding can be in any intermediate position For detailed information on the definition of the various welding positions please consult Appendix E of CSA Standard W59 Welded Steel Construction Metal Arc Welding or AWS A3 0 Standard Welding Terms and Definitions Process mode manual semi automatic machine and auto As it’s such a tricky skill to master gaining the 6G pipe welding certification is a pretty rigorous process You won’t just need to prove that you can use a welding machine your welds will be tested for penetration quality and you may even be forced into a tight space with a restricted view to test your all position welding technique Steel Pipe Diameter in mm Wall in mm Weight lb/ft kg/m Inside Diameter in mm Cross Sectional Area in² cm² Total Area of Pile in² cm² Internal Area in² cm² Internal Volume ft³/ft m³/m External Coating Area ft²/ft m²/m Moment of Inertia in⁴ cm⁴ Section Modulus in³ cm³ Radius of Gyration in cm Maximum Available Yield Strength of Pipe welding has four positions 1G the horizontal rolled position In this position the pipe is horizontal and it is being rolled so that you the welder are actually in a flat position relative to the pipe It& 39 s the easiest pip welding welding position 5G the horizontal fixed position 5G is a lot like 1G in that the pipe is in the • Depending on the pipe size a half round file can be used to remove any burrs created when the land is ground on to the end of the pipe Welding the Root Pass Before beginning to weld the pipe the procedure should be checked to assure that the correct electrode is being used This includes the diameter and the classification of the electrode This solution extends ConceptDraw PRO v 9 mechanical drawing software or later with samples of mechanical drawing symbols templates and libraries of design elements for help when drafting mechanical engineering drawings or parts assembly pneumatic Pipe Welding Symbols Chart Pdf

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Weldbend HomeC −08 Guidelines For Pipe Welding For product information Owner’s Manual translations and more visit FORWARD These General Welding Guidelines are intended to provide background information and supplementary instructions to contractors and their welders who are using National Certified Pipe Welding Bureau Welding Procedures Specifications WPSs This document is divided into two sections Mandatory Practices and Recommended Practices Gas Flow – Most people learn to weld using the GMAW mig process Adequate gas flow for GMAW typically ranges from 35 to 50 cubic feet per hour We need a lot less flow in tig welding A flow of 15 to 25 cfh will cover most applications Very large cup sizes will require more flow but for the apprentice using about 20 cfh is sufficient Pipe Size Chart Nominal Pipe Size NPS is a North American set of standards used to designate pipe diameter and thickness Pipe size is specified with two non dimensional numbers a nominal pipe size NPS for inside diameter based on inches and a schedule Sched or Sch for wall thickness Get more information on pipe sizes and tolerances The Horizontal Fixed Weld position is a pipe welding position and the pipes axis is nearly horizontal Note that the pipe being welded is not being rotated as you weld See below for more information on Pipe welding positions The Horizontal Rolled Weld is a pipe welding position as well and it is being done in the flat position Note that the Mar 30 In general the pipe welding position is divided into 2 types namely the welding position on the groove joint and the welding position on the fillet joint Mostly welding connections on pipes use groove joints type so we often hear the term pipe welding position The pipe welding position is divided into 4 groups namely 1G 2G 5G and 6G • Pipe is laid Bell onto Spigot • Pipe is engaged at about a 10 degree angle • Tack weld made at Field Top which serves as hinge • Pipe lowered to proper grade and pulled into alignment Stab is limited to 1” min and no closer that 1” to bell tangent Tack Weld Graphics Courtesy AWWAPipe welding certifications You can train in various different pipe welding techniques and earn certifications for each of the different pipe welding positions However as mentioned previously a 6G welding certification is really appealing to many welders and employers because of the high skill level which the technique requires

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with quality welding at reduced costs through the use of certified welding We Believe in Codes The National Certified Pipe Welding Bureau has a deep and abiding belief in codes and has always promoted compliance with them Such compliance produces sound welds and is economical for both contractor and owner It saves resourcesProcesses F 01 Guidelines For Gas Tungsten Arc Welding GTAW TIG GTAW Welding For product information Owner’s Manual translations and more visitAdequate gas flow for GMAW typically ranges from 35 to 50 cubic feet per hour We need a lot less flow in tig welding A flow of 15 to 25 cfh will cover most applications Very large cup sizes will require more flow but for the apprentice using about 20 cfh is sufficient See the chart below for recommended flow rates The fitting is welded fully up to the outer edge of the weld bevel The groove weld has a transition weld cap that provides a smooth transition to the main pipe wall The use of excessive weld metal is not allowed A large increase in weld cross section is just as bad as not having enough weld cross section Apr 22 Carbon Dioxide or CO2 Also known as MIG gas Another very common option among natural gases we exhale CO 2 as do all animals – though plants inhale it It is cheap and easy to produce on an industrial scale CO2 welding gas mostly used gas for MIG welding is used for shielding the arc and molten pool a the minimum Ordered wall thickness of the pipe times the nominal wall thicknass of pipe ordered to a pipe schedule wall thickness that has an under tolerance Of 12 5% the minimum Ordered wall thickness of the cylindrical welding end of a component or fitting Or the thinner Of the two when the joint is between two components stainless steel Schedule 10S in Sizes thru 12" and to Schedule 10 in sizes 14" and larger 2 Standard Wall thicknesses are identical tostainless steel Schedule 40S in sizes thru 12" 3 Extra Strong Wall thicknesses are indentical to stainless steel Schedule 80S in sizes thru 12" 4 May be of welded pipe x rayed and stress relieved 5 automation and semiautomatic welding applications • All position welding capability • Excellent weld bead appearance • Lower hydrogen weld deposit — generally less than 5 mL/ g of weld metal • Lower heat input when compared to other welding processes • A minimum of weld spatter and slag makes weld clean up fast and easy 2G pipe welding position this is a welding position that is easy to do 2G welding position is a position where the pipe is in a vertical direction and weld axis in horizontal direction The welder conducts welding from the side of the pipe with horizontal welding direction 5G pipe welding position