焊接锅炉及压力容器等结构时,经常要求焊接接头完全焊透,以满足受压部件的质量和性能要求。但由于构件尺寸和形状的限制,如小直径容器,管道在里面无法施焊,只能在容器外侧进行焊接,如果在外侧采用常规的单面焊法,里面会焊不透,存在咬边和焊瘤等缺陷,不能满足焊接质量的要求。 Welding boilers and pressure vessels and other structures, the welding joints are often required full penetration to meet the quality and performance requirements of the pressure parts. However, due to component size and shape constraints, such as small diameter containers, the pipe can not be welded in the inside, can only be welded on the outside of the container, if the outside of the conventional single-sided welding method, which will not penetrate, there are undercuts and Welding defects such as welding, welding quality can not meet the requirements.