... 顶上阀 overhead valve 仰熔接 overhead welding 架空电线，架空线 overhead wire ...
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... overhanging beam 悬臂梁 overhead welding 仰脸焊 overlap 焊瘤 ...
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overhead welding seam 仰焊缝
overhead position welding 仰焊 ; 氧焊
overhead position of welding 仰焊位置
overhead positions welding 仰焊仰焊
horizontal overhead position welding 仰角焊
welding in overhead position 仰焊
overhead d welding 仰焊
overhead fillet welding 仰角焊
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For overhead pipeline, welding with basic-compound coated electrodes and pre-welding heating of the joint will reduce the joint thermal -stress.
采用碱性药皮焊条和焊前接头预热的施焊方法，焊接的空间管道接头热应力小。
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