(1) the first edge of the welding beam, beam web on both sides of the flange bead to maintain symmetrical welding.
(2) to be welded under the flange, and then welded on the flange.
(3) If the flange plate thickness greater than 30mm, the upper and lower flange should be welding welding.
(4) welding process parameters:
CO2 gas welding: wire diameter φ1.2mm, current 280 ~ 360A, welding speed 300 ~ 500mm / min
Wire length of about 20 mm, gas flow 20 ~ 80L / mm
Voltage 30 ~ 38V, interlayer temperature 120 ~ 150 ℃
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