Publication detail

Plasma overlay welding of cobalt alloy

SIGMUND, M.

Original Title

Plasma overlay welding of cobalt alloy

Type

journal article in Web of Science

Language

English

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.

Keywords

Cobalt alloy – Stellite, creep resistant steel, overlay welding, plasma transfer arc (PTA) welding, valve seat, metal powder, preheating, hardness, pWPS, WPQR, WPS.

Authors

SIGMUND, M.

Released

1. 10. 2019

Publisher

MM (Modern Machinery) Science Journal

Location

Prague

ISBN

1803-1269

Periodical

MM Science Journal

Year of study

2019

Number

10

State

Czech Republic

Pages from

2982

Pages to

2986

Pages count

5

URL

https://www.mmscience.eu/journal/issues/October%202019/articles/plasma-overlay-welding-of-cobalt-alloy

BibTex

@article{BUT159010,
  author="Marian {Sigmund}",
  title="Plasma overlay welding of cobalt alloy",
  journal="MM Science Journal",
  year="2019",
  volume="2019",
  number="10",
  pages="2982--2986",
  doi="10.17973/MMSJ.2019\{_}10\{_}2018132",
  issn="1803-1269",
  url="https://www.mmscience.eu/journal/issues/October%202019/articles/plasma-overlay-welding-of-cobalt-alloy"
}