Study on welding process performance of HG70D high strength steel plate

In this paper, the performance of HG70D welded joint of ultra-high strength steel plates is presented, and the performance of HG70D and Q345B welded joints is studied. The high strength steel plate HG70D showed excellent weldability. Through the X-ray inspection of welded joints, tensile strength, impact test and bending performance test, the comprehensive performance of the joint was excellent. The macroscopic and microscopic metallographic analysises of the welded joints show that the welding seams included pearlite, sorbite, ferrite, etc. The influence of stress annealing temperature on HG70D of high strength steel plate was analyzed by heat treatment.

大台阶薄壁旋压圆筒内径一致性工艺研究

通过两种方案的旋压工艺试验对比,分析了大台阶薄壁圆筒旋压过程中出现的内径一致性较差的问题。避开旋压变形空间变形曲面分析的复杂性,将旋压变形分解为两个轧制过程,从轧制工艺学的角度解释了道次减薄率、进给率对强力流动旋压的影响。试验中得到了满足要求的工艺参数。试验表明:大台阶薄壁圆筒内径一致性较差时,应合理布置旋压道次,分配道次减薄率,能够有效控制圆筒内径尺寸,提高产品内径的一致性。