Steel 17-4PH belongs to the group of corrosion resistant martensitic steels. Because of its favourable mechanical properties and corrosion resistance, the steel has found applications in the aviation, petrochemical, chemical and other industries. The article present results of the laser butt welding of steel 17-4PH without the use of the filler metal as well as the effect of selected types of heat treatment on the structure and mechanical properties of the weld. The test results revealed that the welding process alone enabled the obtainment of favourable mechanical properties, whereas the use of heat treatment led to the homogenisation of the welded joint area.

doi: 10.17729/ebis.2022.5/3