. . Welding Grooves ’ Forms and Types GXX-XXXXX 1ScopeThis document defines the code of welding groove, chamfering and different kinds of grooves. This document can be used for all structural welding joints.2 Definitions of groove code 2.1 Butt joint Groove type ：I ，V，1/2V，Y，X，K，DY( )Welding process A：Automatic(SAW) S：Combined(FCAW+SAW) C：Semi-auto E：Electro slag G：Electo gas F: FCB SAWWelding process ：O-One side weldingDABCGroove：direction of 2/3 grooveGroove direction： S or NC：Chamfer2EFGradsGChamfered side （S or N ）2.2 Fillet joint Inverse indicated side60°Round weldingF: full-penetration fillet weld;P: partial-penetration fillet weld.Indicated sideLength of weldSpace between weldsIndicated lineThroat of weldL-PTF.P. . . . 3 Chamfering If two base plates’ thickness are different, they should be constructed as Table 1. Table 1 Chamfering details Arrangement plan Note Section Plan tLat1SVSCNat1t—a=t1-t —Chamfering if a＞3mm；—L=3a; —The direction of these grooves as I,1/2V,V,X, ，K ；—Consider the thin plate, when automatic welding. t1tLaSVNCNat1ttaL1tCSaSVSt1Lat1ttCSaSVNt1taLt1Ltt1SVNCSaCNa. . 4 Butt joint When welding different grade materials, choose the easily constructed process. 4.1 Groove types for FCB SAW (See Table 2)；Table 2 Groove type for FCB SAW Process Code Sketch Applicable plate Note One-side SAW FYS +1.5-0.53+1-00°60°±3t2t18≤t ＜19 —Used for A，B，D，AH32，AH36 DH32，DH36 steel; —Used for long butt joint in the panel flow line; —No back gouging ；—Consider t1,when t1
