Q690D中厚板多层多道焊接工艺的研究

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中图分类号：TG456.9

Abstract：The Q69OD mentioned in the article is a high-strength steel with good comprehensive performance， and is mostly used as a medium thick plate in practical production applications.High strength steel has a strong tendency towards quenching and poor weldability. Optimizing welding process parameters to obtain welded joints with good comprehensive performance is a key technology in this field.This experiment addresses the issue of cold cracking in high-strength steel welding seams and proposes corresponding improvement process measures. Narow weld beads are implemented in multi-layer and multi pass welding，and the feasibility of multi pass welding with welding parameters that take into account practical production is considered. After multiple welding tests，a set of eficient and reliable welding process parameters has been summarized，and the comprehensive mechanical properties of the welded joints meet the product design requirements.

Key words： medium thick plate； narrow weld bead; multi-layer and multi pass；cold cracking

0 前言

近年来，为适应综合机械化采煤的需要，中国液压支架产量呈现爆发性的上升态势。（剩余3514字）