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发明公开
CN107498143A P355NH和18MnD5异种钢的焊接方法 无效 - 驳回

P355NH和18MnD5异种钢的焊接方法
摘要：
本发明属于异种钢焊接技术领域，具体涉及P355NH和18MnD5异种钢的焊接方法。为了解决对P355NH和18MnD5进行焊接时，在两者的焊接接头区域存在着易于出现焊接裂纹和脆性断裂的问题，本发明公开了一种P355NH和18MnD5异种钢的焊接方法。该方法包括：步骤S1，对待焊接的P355NH和18MnD5异种钢母材进行坡口加工和焊接组对；步骤S2，对待焊接的P355NH和18MnD5异种钢母材进行焊前预热处理；步骤S3，对P355NH和18MnD5异种钢母材进行多层焊接操作，多层焊接操作依次包括：打底层焊接、填充层焊接和盖面层焊接；步骤S4，对焊接后得到的P355NH和18MnD5异种钢焊接接头进行焊后热处理。在本发明中，通过对焊接操作过程中参数的选取和控制，从而实现对P355NH和18MnD5异种钢的焊接，并且获得焊接性能优良的焊接接头。
摘要（英）：

The invention belongs to the technical field of welding of dissimilar steel, particularly relates to a welding method for P355NH and 18MnD5 dissimilar steel, and discloses a welding method for P355NH and 18MnD5 dissimilar steel in order to solve the problem that welding cracks and brittle fracture are likely to be produced in a welding joint area of P355NH and 18MnD5 when the P355NH and the 18MnD5 are welded. The method comprises the steps that 1, edge preparation and welding assembling are carried out on P355NH and 18MnD5 dissimilar steel base metal to be welded; 2, preweld preheat treatment is carried out on the P355NH and 18MnD5 dissimilar steel base metal to be welded; 3, multi-layer welding operation is carried out on the P355NH and 18MnD5 dissimilar steel base metal, wherein the multi-layer welding operation sequentially comprises base coat welding, filling layer welding and cover face layer welding; and 4, a P355NH and 18MnD5 dissimilar steel welding joint obtained after welding is subjected to postweld heat treatment. In the welding method, the parameters in the welding operation process are selected and controlled, so that welding for P355NH and 18MnD5 dissimilar steel is completed, and the welding joint with the excellent welding performance is obtained.

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