分析结果表明，厚板焊接工形截面残余应力的大小及分布，除了与焊接输入热量有关外，尚与截面几何尺寸有关。
The studying results indicate that the magnitude and distribution of residual stress are related to the heat input created by welding process and to the cross section geometry.
不透钢的返修，应尽量采用间歇和分段气刨，以减少热量输入，并彻底清除渗碳层，露出金属光泽后方可焊接。
For the repair of stainless steel, to reduce heat energy and clean completely, gouging should in discontinuous way.
结果表明，焊接时输入热量过高产生的原始裂纹是球阀断裂的主要原因。
The results show that the original crack is brought by high welding heat, which can cause the broken of ball valve.
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