Quick Coupling welding process B

(4) weld line of quick coupling energy. With the decrease of the welding energy, the deposited metal horizontal shrinkage will be reduced. However, if the weld is divided into few welding. And the first bead welding line energy, the total amount of lateral contraction will reduce o This is because the welding line energy of the first weld bead after welding, horizontal shrinkage than a situation a slight increase, but decreased the total amount of lateral contraction in non-repeatable welding complete article welding.In other words, the multi-pass welding, the use of large heat input welding bead is advantageous to reduce the transverse joints contraction.

(5) Quick Coupling leveled gouging. Stripped off - part of the weld metal, and has little effect on the transverse contraction, but subsequent re-welding causes the contraction increased. Gouging and re-welding the contraction of the same impact, the gouging specimen heated, thereby shrink increase,further increase in the contraction of the subsequent re-welding will make.