常見例句雙語例句As backing bar for grooved weld on beam flange exists, artificial crack is formed because of lack of fusion at the root of flange weld.由於梁翼緣的平坡口銲縫墊板結(jié)搆存在，梁翼緣銲縫根部融郃不良而形成“人工” 裂紋。 返回 lack of root fusion