低碳调质高强钢WQ960E实际生产中焊接工艺参数选择
Welding parameter selection for low carbon hardened and tempered high-strengthed steel WQ960E in the practical production
马鲁峰，郝洪德，姚强
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作者单位：山东电力建设第二工程公司
中文关键字：WQ960E； 焊接；预热温度；层间温度；冲击功
英文关键字：WQ960E ; welding; preheat temperature; interpass temperature; impact energy
中文摘要：通过无损探伤、拉伸试验、180°侧弯试验和-40℃冲击试验等方法并结合实际生产经验对WQ960E高强钢焊接参数的选取和优化进行了研究，试验结果表明，随着预热温度和层间温度的提高，焊缝冲击功明显上升；在焊接WQ960E钢板的过程中，采用小焊接线能量的同时，宜选用预热温度(150±25)℃，层间温度与预热温度相同。实际生产过程中，大型高拘束力构件焊接时宜采用电加热跟踪预热方式，尽量采用多层多道焊接，在环境温度较低时，焊后应采取必要的缓冷措施。
英文摘要：Selection and optimization of welding parameter of high-strengthed steel WQ960E have been investigated by nondestructive inspection, tensile test, side bend test and impact test, with experience in the practical production being taken into consideration. The results show that the impact energy raises obviously with the increase of the preheat and interpass temperatures. It is suitable to choose interpass temperature of 150±25℃, the same as preheat temperature, and lower weld heat input should be adopted during welding of WQ960E steel. Trace preheating by electrical heating as well as multi-cover and multi-path welding should be employed for large-scale component with big binding force during welding in practical production. Slow cooling should also be used after welding in case of lower ambient temperature.