A4 Conference proceedings

Modified Short Arc GMAW Techniques for Welding a Root Pass


Publication Details
Authors: Martikainen Jukka, Kah Paul
Publication year: 2009
Language: English
ISSN: 1822-2951
JUFO-Level of this publication: 0
Open Access: Not an Open Access publication

Abstract

The
development of welding power sources towards new digital devices helps
us to get better results at welding root passes without backing. This
study evaluates the quality and productivity of a root pass welding with
5 mm thick austenitic stainless plates by the new modified short arc
Gas Metal Arc Welding (GMAW) method together with conventional welding
methods. Welding runs were made under different fit-up gaps and the
various process parameters were continuously observed for the processes.
The modified short arc GMAW techniques offer a number of advantages
over the conventional welding methods (GMAW, GTAW and SMAW) when welding
root passes from a single side without backing due to the fact that the
current mode used in conventional welding methods is not sufficient
enough to be used for welding root passes. It was found that 1) a faster
welding speed, 2) a higher quality weld without, e.g., a lack of
penetration or an excessive root and 3) a narrower Heat Affected Zone
(HAZ) can be reached using less energy with modified short arc GMAW
techniques than with conventional welding processes. It was also
possible to fill up 4 mm gaps with one pass by the new modified short
arc technique with a plate thickness of 5 mm, which was not possible
with the other processes.


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Last updated on 2017-09-11 at 14:49