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.由于梁翼緣的平坡口焊縫墊板結(jié)構(gòu)存在，梁翼緣焊縫根部融合不良而形成“人工” 裂紋。 返回 lack of root fusion