Effect of process parameters on metal transfer of hyperbaric GMAW of duplex stainless steels

Conference · Sat Dec 31 04:00:00 EST 1994

OSTI ID:433614

Olsen, J M; Dos Santos, J F ^[1]; Richardson, I M ^[2]

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1. GKSS-Forschungszentrum Geesthacht GmbH (Germany)
2. Cranfield Univ. (United Kingdom)

This work presents the preliminary results of a comprehensive and systematic evaluation of current rise and fall rates as well as shielding gas composition and their affect on the metal transfer, when duplex stainless steels are GMA welded under hyperbaric conditions using the short circuit metal transfer mode. The evaluation of the test results are based on an examination of the welding process signals recorded on a transient recorder. Over a time period of 500 ms, the signal was measured to assess the process instability, current rise and fall rates and their inter-relationship. The results presented in this study indicate that for a given welding condition, the appropriate selection of current rise and fall rates can minimize the effect of instabilities caused by high ambient pressure. The presence of active gases in the shielding did not significantly affect the metal transfer behavior. All the experiments described in this work have been carried out in the hyperbaric test facilities of the GKSS-Forschungszentrum in Germany.

• OSTI ID: 433614
• Report Number(s): CONF-940409--; ISBN 1-880653-10-9
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
42 ENGINEERING
ARC WELDING
OFFSHORE PLATFORMS
PROCESS CONTROL
REPAIR
STAINLESS STEELS
WELDED JOINTS