Publication detail
Plasma overlay welding of cobalt alloy
SIGMUND, M.
English title
Plasma overlay welding of cobalt alloy
Type
journal article in Web of Science
Language
en
Original abstract
This article describes the overlay welding of a cobalt alloy. This overlay is made by the plasma transfer arc (PTA) welding technology. Cobalt alloy is overlaid on a creep resistant steel as the seat of a high-pressure steam valve. High-pressure steam valves are used in the energy, nuclear, petrochemical, oil, gas and pharmaceutical industries. Creep resistant high alloy steels are weldable with proper welding conditions, including stress relieving. Cobalt alloys, on the other hand, have worse weldability. Overlay welding of these heterogeneous materials is possible as well with meeting specific conditions especially proper welding parameters. In this article, the whole experiment is described, including design of the part that is overlaid by plasma arc welding. The technological procedure of overlay welding is described, including a description of the welding equipment, subsequent evaluation and all standards and specified inspections needed for welding procedure qualification (WPQR). WPQR qualification of overlay welding was also done and finished with Notify Body.
English abstract
This article describes the overlay welding of a cobalt alloy. This overlay is made by the plasma transfer arc (PTA) welding technology. Cobalt alloy is overlaid on a creep resistant steel as the seat of a high-pressure steam valve. High-pressure steam valves are used in the energy, nuclear, petrochemical, oil, gas and pharmaceutical industries. Creep resistant high alloy steels are weldable with proper welding conditions, including stress relieving. Cobalt alloys, on the other hand, have worse weldability. Overlay welding of these heterogeneous materials is possible as well with meeting specific conditions especially proper welding parameters. In this article, the whole experiment is described, including design of the part that is overlaid by plasma arc welding. The technological procedure of overlay welding is described, including a description of the welding equipment, subsequent evaluation and all standards and specified inspections needed for welding procedure qualification (WPQR). WPQR qualification of overlay welding was also done and finished with Notify Body.
Keywords in English
Cobalt alloy – Stellite, creep resistant steel, overlay welding, plasma transfer arc (PTA) welding, valve seat, metal powder, preheating, hardness, pWPS, WPQR, WPS.
Released
01.10.2019
Publisher
MM (Modern Machinery) Science Journal
Location
Prague
ISSN
1803-1269
Volume
2019
Number
10
Pages from–to
2982–2986
Pages count
5
BIBTEX
@article{BUT159010,
author="Marian {Sigmund},
title="Plasma overlay welding of cobalt alloy",
year="2019",
volume="2019",
number="10",
month="October",
pages="2982--2986",
publisher="MM (Modern Machinery) Science Journal",
address="Prague",
issn="1803-1269"
}