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对煤矿机械中液压支架用1 000 MPa级高强钢的焊接性进行了试验研究。采用热影响区最高硬度试验、斜Y形坡口焊接裂纹试验和窗形拘束度试验测试了该钢对冷裂纹的敏感性,并研究了不同热输入焊接工艺参数下及焊后热处理焊接接头的力学性能变化规律。结果表明,该钢具有一定的冷裂倾向,在适当的预热条件下可避免冷裂纹产生。焊接过程要合理控制热输入及道间温度以保证接头力学性能。焊后高温消除应力处理应慎用。该研究对高端液压支架的焊接具有一定的参考意义。
Experimental research on the weldability of 1 000 MPa high strength steel for hydraulic supports in coal mining machinery was carried out. The sensitivity of the steel to cold cracking was tested by the maximum hardness test in the heat-affected zone, the welding crack test with oblique Y-groove and the window restraint test. The effects of different heat input welding process parameters and post-weld heat treatment on the welded joint Mechanical properties of the law of change. The results show that the steel has a tendency of cold cracking, cold cracks can be avoided under the appropriate preheating conditions. Welding process should be reasonable control of heat input and interpass temperature to ensure mechanical properties joints. After welding to eliminate stress treatment should be used with caution. The research has certain reference meaning to the welding of high-end hydraulic support.