handhold with butt welded flange 对焊法兰手孔 handhole with butt welded flange 对焊法兰手孔 ; 对于焊法兰手孔 manhole with butt welded flange 对焊法兰人孔 ; 对于焊法兰人孔 ..
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... metal inertia gas welding金属焊条惰性气体掩护焊; 熔化极惰性气体掩护焊 handhole with butt welded flange对于焊法兰手孔 reinforced weld增强烧焊 ...
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