Welding Process Selection
Selection of Welding Process :
Following point shall be taken care while selecting a process
1.Thickness
2. Position
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.
9.Equipment cost;
10.Safety aspects:
WELDING PROCESSES
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
1.FUSION WELDING
2.PRESSURE WELDING
FUSION WELDING PROCESS
1.OXY FUEL WELDINGÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â OFW
2.SHIELDED METAL ARC WELDINGÂ Â Â Â Â Â Â Â Â Â Â Â SMAW
3.GAS METAL ARC WELDINGÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â GMAW
4.GAS TUNGSTEN ARC WELDINGÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â GTAW
5.SUBMERGED ARC WELDINGÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â SAW
6.FLUX CORED ARC WELDINGÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â FCAW
7.ELECTROSLAGÂ WELDINGÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â ESW
8.ELECTROGAS WELDINGÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â EGW
9.ELECTRON BEAM WELDINGÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â EBW
10.LASER WELDINGÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â LW
11.THERMIT WELDINGÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â TW
PRESSURE WELDING PROCESS
1.RESISTANCE WELDINGÂ Â (SPOT, SEAM, PROJECTION)
2.FLASH BUTT WELDING
3.EXPLOSIVE WELDING
4.STUD WELDING
5.FRICTION WELDING
6.INDUCTION WELDING
