2. Choose the combination of manual welding and CO2 gas shielded welding to locate the arc manually. J422 and H08A are both acceptable.
3. Single K groove on the web. Fillet weld.
4, it is best to double beam construction at the same time, back to back. 2. Welders should butt weld at the same time. Select the back welding method. After welding a small grid, reverse welding the reverse side, and then welding the root. Pay attention to the interlayer temperature.