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。
Contact mark. Intermittent marks adjacent to the weld line resulting from the electrical contact between the electrodes supplying the welding current and the pipe surface.
能在良好的条件下运用数千磅的压力于金属盘或焊接处，导致破坏，但在完成后却没有留下任何痕迹。
Can apply thousands of pounds tension to metal stock or welds in excellent condition, causing breakage, yet NO TOOL MARKS are left on the finish.
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