Welding Process Selection
Selection of Welding Process :
Following point shall be taken care while selecting a process
3.Groove size : Narrow or wide
4.Cleanliness : Gas welding
5.Heat Factor : Temp limitation if harmful precipitation is likely to occur.
6.Fabrication : Visual Insp.. Requirements, Distortion, color match
7.Work place location;
8.Application :For structural jobs aws gives pre-qualified wps with SMAW, SAW, GTAW, GMAW.
SMAW : This process is widely used due to its portability,low initial cost & versatility . More useful for field & erection weld.
GTAW : This process is used for adaptability to certain material like s.s. titanium, al. Gives very high quality weld & giving low heat input.
SAW : This process gives very high production.. Generally Used for shop floor work & field work. The limitations are, can not weld in overhead position. Very heavy set-up & initial cost is very high.
WELDING PROCESS ARE BROADLY CLASSIFIED INTO
FUSION WELDING PROCESS
1.OXY FUEL WELDING OFW
2.SHIELDED METAL ARC WELDING SMAW
3.GAS METAL ARC WELDING GMAW
4.GAS TUNGSTEN ARC WELDING GTAW
5.SUBMERGED ARC WELDING SAW
6.FLUX CORED ARC WELDING FCAW
7.ELECTROSLAG WELDING ESW
8.ELECTROGAS WELDING EGW
9.ELECTRON BEAM WELDING EBW
10.LASER WELDING LW
11.THERMIT WELDING TW
PRESSURE WELDING PROCESS
1.RESISTANCE WELDING (SPOT, SEAM, PROJECTION)
2.FLASH BUTT WELDING