焊根是焊缝背面与母材的交接处。（图片中空心圆） 焊趾是焊缝表面与母材交界处。（图片中实心圆）
同时也介绍了该设备在管道根焊和高效焊接方面的应用。
Also, the application of the new machine in pipeline root welding is introduced.
所有这些和其他的新技术都显示焊接不再是过去那样，只用气体火焰或一根焊条焊一道焊缝的简单问题了。
All these and other developments show that welding is no longer what it was in time past, the simple matter of running a bead with a gas flame or a stick electrode.
通过对13 -5型马氏体不锈钢焊接接头进行等离子弧清根及碳弧气刨清根的比较，证明等离子弧清根对全焊透焊缝实施背面清根是可行的。
By comparing backgouging of plasma arc with carbon arc to the welded joint of 13-5 martensitic stainless steel, the backgouging of plasma arc is proved feasible for the full penetration weld.
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