焊接长钢轨 meaning in Chinese

ribbon rails
welded long rail

This paper analyzes the cause of small concaves around the welding seam in the long rail of guangzhou metro line 2 , and presents preventive measures , such as increasing the under layer of the rail , limiting the weld seam , lowering the welding temperature etc
摘要结合广州地铁2号线接触焊焊接长钢轨的实践，分析了产生焊头表面小凹痕的原因，提出改变垫高钢轨的方式、缩小正火范围、降低正火温度、限制接头错牙量等预防措施。