而er預yu熱re亮liang光guang對dui焊han看kan似si與yu之zhi類lei似si
，實shi質zhi上shang仍reng是shi不bu同tong的de，預yu熱re亮liang光guang對dui焊han需xu求qiu在zai不bu鏽xiu鋼gang鏈lian條tiao的de連lian續xu亮liang光guang焊han前qian增zeng加jia一yi次ci預yu熱re進jin程cheng
，以yi擴kuo展zhan焊han接jie熱re影ying響xiang區qu，當dang鋼gang筋jin抵di達da預yu熱re溫wen主zhu後hou進jin入ru亮liang光guang階jie段duan，附fu後hou頂ding鍛而成。