Welding Technology of One Type of High Strength Steel

The high strength steel has high strength, carbon equivalent and tendency to welding cold cracking. It is significant to ensure the welding quality and improve the welding efficiency. In this study, the welding efficiencies, welding mechanical performances, welding technologies of the manual arc welding, gas shielded welding, and double side arc welding are compared and analyzed. It is found that the efficiency of gas metal arc welding is more than 2 times of that of the manual electrode arc welding and that the efficiency of double-side welding is the highest. With the increase of the welding input increases, the strength decreases and the toughness increases. To ensure the temperature between layers/passes, at the vertical positions, the length of the welding pass for manual electrode arc welding should not be greater than 1.2 m, and that for the gas metal arc welding no greater than 0.9 m. At the horizontal positions, the length of the welding pass for the manual electrode arc welding should not be greater than 1.9 m, and that for the gas metal arc welding no greater than 2.8 m.