dc.contributor.author |
Suder, Wojciech |
|
dc.contributor.author |
Ganguly, Supriyo |
|
dc.contributor.author |
Williams, Stewart W. |
|
dc.contributor.author |
Yudodibroto, Bagus |
|
dc.date.accessioned |
2017-06-09T14:49:17Z |
|
dc.date.available |
2017-06-09T14:49:17Z |
|
dc.date.issued |
2017-05 |
|
dc.identifier.citation |
Wojciech Suder, Supriyo Ganguly, Stewart Williams and Bagus Yudodibroto. Root stability in hybrid laser welding. Journal of Laser Applications, Volume 29, Issue 2, article number 022410 (2017) |
en_UK |
dc.identifier.issn |
1042-346X |
|
dc.identifier.uri |
http://dx.doi.org/10.2351/1.4983161 |
|
dc.identifier.uri |
https://dspace.lib.cranfield.ac.uk/handle/1826/11997 |
|
dc.description.abstract |
Hybrid laser welding offers promising advantages over the traditional arc-based welding processes. The
high penetration ability of lasers and the filler wire delivery of gas metal arc welding (GMAW) enable
joining of thick section materials without the need of multi-pass. The output power of modern solid state
lasers provides enough energy to penetrate thicknesses exceeding 20 mm in steel. However, the high aspect
ratio fusion zone with the rapid solidification does not always provide beneficial conditions for achievement
of good weld profiles. Distribution of the liquid metal between the top and root sides of a joint, and hence
the weld profile, are determined by a complex balance between the vaporization pressure of a laser, the
electromagnetic force of an arc and the surface tension of a meltpool. In this work, the stability of root
profile and all aspects related to the achievement of acceptable roots in pipeline welding have been
investigated. It has been found that in order to achieve a smooth root profile in deep penetration hybrid
laser welding, not only a sufficient penetration force, but also a certain amount of energy need to be
provided. This is required to maintain the keyhole fully developed with a steady state pressure balance
throughout the thickness. It is also important to achieve sufficient temperature in the root and to provide
appropriate wetting between the liquid metal and the back surface of the material. Depending on the power
density and energy used, different regimes were identified with sagging of the root in the initial stage,
followed by good quality root profiles and then ending on excessive melt expulsion with further increase
of power density. The results suggest that if operated in the right regime, the process is very tolerant, in
terms of energy and power density required for acceptable root profiles and good quality joints can be
achieved. |
en_UK |
dc.language.iso |
en |
en_UK |
dc.publisher |
Laser Institute of America |
en_UK |
dc.rights |
©2017. Laser Institute of America. Please refer to any applicable publisher terms of use. |
|
dc.subject |
Laser hybrid welding |
en_UK |
dc.subject |
pipe welding |
en_UK |
dc.subject |
melt flow |
en_UK |
dc.subject |
root formation |
en_UK |
dc.title |
Root stability in hybrid laser welding |
en_UK |
dc.type |
Article |
en_UK |