...节 波纹膨胀节 金属膨胀节 非金属膨胀节 补偿器 金属补偿器 非金属补偿器 波纹补偿器 rk流痕 welding mark溶合痕 post screw insert螺纹套筒埋值 ..
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welding g mark 溶合痕
Designing with mark-up is like welding I-beams without a blueprint.
设计过程要额外付费就好比焊接钢材不需要蓝图。
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。
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