The long neck flange should have stress-relief heat treatment after welding.
拼接法兰应进行焊后消除应力热处理。
The result shows that it is more reasonable, safe and reliable to adopt procedure with warm up before welding and post heat treatment after welding.
结果表明：采用焊前预热和焊后热处理的焊接工艺方案所获得的焊接接头比不采用以上措施获得的焊接接头更为合理，应用更安全、可靠。
By simulating welding and simulating heat treatment after welding, CCT Curves of UIC900A and U75V rail steels are determined by the expansion method.
模拟钢轨焊接及焊后热处理工况，采用热膨胀方法分别测定uic 900a及u75 V钢轨钢的连续冷转变曲线(CCT曲线)。
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