proportions of welded joints have been standardized. preferred sizes, dimensions ,and charts for calculating the strengths of and amounts of filler metal required for welded joints are given in reference texts and handbooks
还有几个单词
4.the base metal
5.polarity switch
6.not shortness
7.slag inlusion
8.positional welding
9.the welding zone
13.types of welds
15.the ground clamp cable
16the weldability of metals