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发明公开
CN108994424A 一种钢制安全壳免除焊后热处理焊接工艺 无效 - 撤回

一种钢制安全壳免除焊后热处理焊接工艺
摘要：
本发明提供一种钢制安全壳免除焊后热处理焊接工艺，其包括如下步骤：焊接前准备和焊接参数的控制：对工件进行预热，预热温度≥90℃。焊接步骤：当工件进行手工电弧焊时，焊接电流为直流，极性为正极，焊条的扩散氢级别为H4及以上的级别，焊接过程中道间温度≤200℃，焊接热输入≥14kJ/cm，其中，所述工件为60mm厚SA 738Gr.B钢制安全壳。本发明提供的钢制安全壳免除焊后热处理焊接工艺，应用于核电站钢制安全壳筒体环焊缝、筒体纵焊缝、插入板与筒体焊缝焊接上，将降低焊后热处理带来的施工难度、减少施工隐患、节约施工成本、加快施工进度、保证施工质量。
摘要（英）：

The invention provides a steel safety shell welding technology without post weld heat treatment. The steel safety shell welding technology without post weld heat treatment comprises the following steps of preparation before welding and control of welding parameters: a workpiece is preheated with the preheating temperature being larger than or equal to 90 DEG C; welding steps: when manual arc welding is performed on the workpiece, the welding current is a direct current, the polarity is positive, the grade of diffusible hydrogen of a welding rod is a grade with H4 or above, the interpass temperature in the welding process is smaller than or equal to 200 DEG C, and the welding heat input is larger than or equal to 14kJ/cm, wherein the workpiece is an SA 738 Gr. B steel safety shell with thethickness being 60mm. The steel safety shell welding technology without post weld heat treatment is applied to welding of nuclear power station steel safety shell barrel girth welds, barrel longitudinal welds, insertion plates and barrel welds, lowers the construction difficulty brought by post weld heat treatment, reduces construction hidden dangers, saves the construction cost, accelerates the construction progress and ensures the construction quality.

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