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1前言 钢轨焊接后焊缝及热影响区由于受 到焊接高温的影响,造成晶粒粗大,脆性 增大,塑性、韧性下降。为了改善焊接头 的塑性、韧性,提高焊接头综合机械性 能,对接头进行焊后热处理,使焊头性能 符合TB／T1632-91《钢轨焊接接头技术 条件》要求。PD3钢轨焊接接头经过中频 电感应加热正火工艺处理,使焊接接头 晶粒细化,组织均匀,从而提高焊头的塑 性、韧性,达到TB/T1632-91标准,满足 无缝线路的使用要求。
1 Foreword Weld seam and heat affected zone after rail welding due to the impact of high temperature welding, resulting in coarse grains, increased brittleness, plasticity, toughness decreased. In order to improve the plasticity and toughness of the welded joint and improve the comprehensive mechanical properties of the welded joint, the joint is subjected to post-weld heat treatment so that the performance of the welded joint conforms to the technical requirements of TB / T1632-91 rail welded joint. PD3 rail welded joints through medium frequency induction heating normalizing process, the welded joints grain refinement, uniform organization, thereby increasing the plasticity of the welding head, toughness, to TB / T1632-91 standards to meet the requirements of seamless lines .