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发明公开
CN110666301A 一种Q420qE+Q690qENH异种材质复合焊对接方法 审中-实审

一种Q420qE+Q690qENH异种材质复合焊对接方法
摘要：
本发明公开了一种Q420qE+Q690qENH异种材质复合焊对接方法，属于大跨、重载桥梁厚板制造焊接领域，其技术方案要点是，采用Q420qE与Q690qENH异种材质桥梁钢，力学性能特征为：Q420qE屈服强度ReL≥420MPa，抗拉强度Rm≥540MPa，延伸率A≥19％，-40℃冲击功KV2≥120J；Q690qENH屈服强度ReL≥690MPa，抗拉强度Rm≥810MPa，延伸率A≥14％，-40℃冲击功KV2≥120J；坡口采用X型不对称坡口，坡口角度60°，钝边2mm；接头正反面各采用气体保护焊打底两层，采用埋弧自动焊填充盖面。本发明采用异种材质复合焊对接方法，以解决在Q420qE+Q690qENH不同板厚焊接时，无法保证焊接过程中大型钢结构防裂、防断的问题；制造过程中焊前预热至80～100℃、焊后不进行热处理的焊接工艺，采用多层多道连续施焊时接头具有优良的抗裂性和综合力学性能。
摘要（英）：

The invention discloses a hybrid butt welding method for Q420qE and Q690qENH dissimilar materials and belongs to the field of large-span and heavy-load bridge thick plate machining and welding. According to the technical scheme, the hybrid butt welding method is characterized in that Q420qE and Q690qENH dissimilar material bridge steel is adopted; the mechanical performance characteristics of theQ420qE and Q690qENH are shown as follows: Q420qE has the yield strength ReL greater than or equal to 420 MPa, the tensile strength Rm greater than or equal to 540 MPa, the elongation rate A greater than or equal to 19%, and the minus 40 DEG C impact work KV2 greater than or equal to 120 J; Q690qENH has the yield strength ReL greater than or equal to 690 MPa, the tensile strength Rm greater than orequal to 810 MPa, the elongation rate A greater than or equal to 14%, and the minus 40 DEG C impact work KV2 greater than or equal to 120 J; an X-shaped asymmetry groove is adopted, the groove angleis 60 degrees, and the length of the truncated edge is 2 mm; the obverse and reverse surfaces of the joint are provided with two gas shielded welding backing layers, and the capping surfaces are filled through submerged automatic arc welding. Through the hybrid butt welding method for theQ420qE and Q690qENH dissimilar materials, the problem that the anti-cracking and anti-breaking effects of a large steel structure in the welding process cannot be ensured when Q420qE and Q690qENH plates with different thicknesses are welded can be solved. The welding process that the plates are preheated to 80-100 DEG C before welding and are not subjected to heat treatment after welding in the manufacturing process is adopted, and the joint has the excellent anti-cracking performance and comprehensive mechanical performance during multi-layer multi-pass continuous welding.

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