短语词组短語weld toe crack 銲趾裂紋weld solidification crack 銲縫凝固裂紋weld corrosion crack 銲縫破裂weld ream crack 銲縫裂紋weld arer crack 銲縫區裂紋inside weld tiny crack 內銲縫微裂紋weld hot crack 銲縫熱裂紋weld cold crack 銲接冷裂紋 返回 weld crack