Weldner韦尔德纳weldv.焊接；使结合n.焊接；焊缝welding material production焊材生产welding and cutting combine割焊两用机Welding procedure parameter焊接工艺参数welded hollow sphere joints焊接空心球节点welded plate heat exchanger全焊接板式换热器welders and flame-cutters焊接工和火焰切割工welding energy conservation焊接节能welding to mend the defects缺陷焊补Welding in the flat position在平面位置焊welding heat-affected zone焊接热影响区