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．