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发明公开
CN104668796A 核电汽轮发电机屏蔽压圈用厚硅钢板的焊接工艺方法 无效 - 撤回

核电汽轮发电机屏蔽压圈用厚硅钢板的焊接工艺方法
摘要：
本发明公开了一种核电汽轮发电机屏蔽压圈用厚硅钢板的焊接工艺方法。屏蔽压圈用厚硅钢板采用含有2.4～2.9％硅的低合金钢板。工艺过程包括如下步骤：对厚硅钢板进行焊接冷裂纹试验，确定焊接时的最低预热温度，本发明在采用在较高的温度下进行下料，能避免传统工艺下料引起的变形较大的问题；其次,采用预热温度≥150℃的条件下，使用药芯气体保护焊，焊材E70C-6M进行焊接，多层多道焊交替焊满，并后热处理，能解决厚硅钢板焊接已产生冷裂纹问题，最后，在保持预热温度≥150℃时，进行压平、校型，并通过UT探伤。该方法等到的接头符合母材的各种力学要求的，同时，可以避免硅钢板整体下料，显著降低了母材成本。
摘要（英）：

The invention discloses a welding technique of a thick silicon steel plate for a shielding pressure ring for a nuclear steam turbine generator. The thick silicon steel plate for the shielding pressure ring is a low alloy steel plate containing 2.4 to 2.9% of silicon. The technique includes the steps of subjecting the thick silicon steel plate to welding cold crack test, determining lowest preheating temperature for welding, performing feeding at high temperature to avoid high deformation caused by the traditional feeding process, performing flux-cored gas shielded welding with welding material E70C-6M at the preheating temperature not less than 150 DEG C, fully welding multiple beads in alternation, performing post-heat treatment to solve the cold crack problem of the silicon steel plate welded, performing flattening and correcting at the maintained preheating temperature not less than 150 DEG C, and performing UT (ultrasonic test). A connector manufactured by the technique meets various mechanical requirements of base material, overall blanking of the silicon steel plate is avoided, and cost of the base material is evidentially decreased.

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