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Volume
2008 I
Issue
6
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Yapp, David
; Kong, Chang-Jing
Hybrid laser-arc pipeline welding
Welding and Cutting 7 (2008) [6] 342-345
Specialist Articles
Abstract:
Installation of new pipelines is predicted to grow at a rapid rate
over the next twenty years, due in part to the increase use worldwide
of combined cycle power generation plant using natural
gas and fuel. The need to construct large diameter pipelines
over long distances has led to an increased demand to improve
the productivity of pipeline girth welding. Hybrid laser-arc welding
using fibre laser offers significant potential for pipeline
welding. These new lasers have a very small footprint, together
with a high overall efficiency, between 20 and 30%. Hence they
can be considered for use in the field. In this investigation, hybrid
laser-arc welding of pipeline root runs was evaluated and it
was concluded that acceptable quality root pass welds could be
made under a range of welding conditions. Good quality welds
were achieved with a laser power of 4 kW and a welding speed
of 4 m/min. Laser root/GMAW fill welds in X100 pipeline steel
exhibited satisfactory mechanical properties.
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