The Combined Welding of Advanced Steel P460NL2 mod. Used in Railway Tanks

Abstract

There have been presented test results of welding P460NL2 mod. steel in two configurations: combined laser + arc welding and hybrid laser + MAG welding, with various geometry of the joints. There have been assumed requirements for the joints (strength, toughness and hardness) specified in VdTUV 531 act and in PN-EN ISO 15614-1, PN-EN ISO 15614-11 i PN-EN ISO 15614-14 Standards. As a supplement there have been conducted macroscopic metallographic tests. Proper technological parameters of hybrid and combined welding enable to obtain properly formed butt-welded joints. Hybrid welded joints do not meet requirements of the standards, due to exceeded maximum hardness (over 380 HV10). However, combined welding provides obtaining proper welded joint with maximum hardness 360 HV10, strength 665 MPa and toughness over 27 J. The results above meet the technological requirements. Obtained test results are the guidelines for developing the technology possible to adapt in industrial conditions.