The welding seam butt of low alloy steel plate and BV AH420 marine steel plate is installed without clearance, the local weld width is less than 1, and the gas shielded welding is used for positioning welding on the reverse side of BV AH420 marine steel plate. The positioning welding length is 25~35mm, the arc initiation is full, the arc closure is filled with arc pit, and the multi-layer multi-channel welding is used. Each weld shall be soldered and covered.
Welding process parameters of BV AH420 marine steel plate
1) Base material thickness: 8mm~ 20mm;
2) Welding consumables: flux cored wire or stainless steel wire, shielding gas CO2;
3) Welding equipment :YD-350GM full digital panasonic welding machine, YW-35KB wire feeder, air cooled automatic welding gun;
4) Welding current :100 ~150A;
5) Welding voltage :20~24V;
6) Welding speed: 14~16m/h;
7) Gas flow :15~20L/min;
8) Wire dry extension length :8~12mm;
The BV AH420 marine steel plate seam adopts carbon arc air gouging to process the groove, the Angle of the groove is 60℃~70℃, and then it is polished. The dirt such as oxide scale, rust, slag, paint, oil stain, marl and water stain are removed within 30 ranges in the groove and on both sides of the groove, until the surface of the groove and BV AH420 marine steel plate shows metallic luster.
