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.
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
Also, improve the overlapped length of the tail frame and the frame and change the welding seam into intermittent seam, therefore the frame strength can be effectively increased.
改善尾架与车架的搭接长度，将连接焊缝改为断续焊缝，从而有效地提高了车架的强度。
3
Single sided -, intermittent -, chain - or zigzag welding will be allowed, as far as permissible according to the classification society, where structural parts are not exposed to weather or moisture.