电弧烧伤。由于电极(含接地极)与管子表面之间起弧而产生的局部表面熔化点。
Arc Burns. Localized points of surface melting caused by arcing between electrodes or ground and pipe surface.
受热面采用密排圆盘管，受热面布置充足，降低管子表面热负荷，是导热油使用更安全。
Heating area is the closely-aligned round coils. Heating area is arranged sufficiently to reduce the surface heat load of pipe and handle the heat transfer oil safely.
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.
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