MICROSTRUCTURE OF FIBRE LASER WELDED BUTT JOINTS

Abstract

Microstructures and microhardness profiles of butt joints welded by fibre laser were evaluated. Dual phase steel HCT980X and bake hardening steel HX220BD sheets with thickness of 1.2 mm were welded at five different welding parameters. The joints showed microstructural changes from ferrite and martensite in dual phase steels or ferrite in bake hardening steels to acicular ferrite, bainite and martensite in the fusion zones and heat affected zones. The welding resulted in a significant microhardness increases in the fusion zones and even more in the heat affected zones near dual phase stell HCT980X. The microstructures observed in particular weld zones corresponded well with microhardness profiles measured across the joints.

Recommended articles

TEST BENCH FOR TESTING OF THE TRACTION DRIVE OF RAILWAY VEHICLES

PETR HELLER, LUKAS TRPAK, BOHUMIL CEJKA
Keywords: test bench | traction drive | torque transmission | suspension | gearbox oil leakage | fully-suspended drive | computer simulation | optimization

ANALYSIS OF THE WEAR OF SAW BLADE TEETH AND THE PROPOSAL OF METHODS OF INCREASING THEIR WEAR RESISTANCE

JOZEF KRILEK, JAN KOVAC, DANIELA KALINCOVA, MIROSLAVA TAVODOVA, ANDRZEJ PEREC
Keywords: saw blade | cutting edge | wear | tool steel | coating