Contact mark. Intermittent marks adjacent to the weldline resulting from the electrical contact between the electrodes supplying the welding current and the pipe surface.
触点痕。由于供焊接电流的电极与管子表面间的电接触，致使在焊缝线附近产生不连续痕迹。
2
Weld Area crack. A crack in or immediately adjacent to the weldline.
焊缝区裂纹。在焊缝线或紧靠焊缝线出现的裂纹。
3
In engineering, in order to make the weldline even and reliable, it is needed to cut the weld opening accurately.