1 July 2022

Gas flow Rate in welding | PLATE THICKNESS Vs GAS FLOW RATE | # 1

Gas flow Rate in welding

1.) Gas Flow:-
  • The desirable rate of gas flow depends primarily – on weld geometry, speed, current, the type of gas, and the metal transfer mode being utilized.
  • Welding flat surfaces requires – higher flow than welding grooved materials, since the gas is dispersed more quickly.
  • Faster welding speeds mean – that more gas must be supplied to provide adequate coverage.
  • Higher current requires – greater flow, and generally, more helium is required to provide adequate coverage than argon.
2.) Gas Flow Required:-
Metal Transfer Mode
Gas Flow required
Short circuiting & Pulsed spray modes (small weld pools) 10 L/min (20 ft³/h)
Globular transfer 15 L/min (30 ft³/h) is preferred
Spray transfer (higher heat input, larger weld pool) 20-25 L/min (40–50 ft³/h)

 

3.) Plate Thickness V/S Gas Flow Rate:- 
PLATE
THICKNESS
FOR BUTT JOINT IN FLAT POSITION
FOR FILLET JOINT IN FLAT POSITION
                                                                   GAS FLOW RATE (LPM)
1.6–2mm 8–10 10
3mm 8–10 10
6mm 12 12
10mm 12 12
12mm 14 14
16mm 14 16
20mm 16 16
25mm 16 18
32mm 18 20
40mm 18 20

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