... downward spiral向下旋转；螺旋式下跌；减记恶性循环 downward movement向下运动 downward welding平焊，俯焊 ...
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vertical downward welding 向下立焊
vertical-downward welding 从上到下立焊
downward welding technique 下向焊技术
Welding vertically downward 垂直的从上往下焊
welding upward and downward 向下向上焊
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In horizontal position welding, the gravity makes molten metal flow downward and sometimes causes weld defects such as undercut and overlap.
横向焊接时由于熔化金属重力的作用，会引起熔池金属下淌，从而产生咬边以及焊瘤等焊接缺陷。
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