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The HLAW process takes advantage of the high energy density of the laser beam while benefiting from the alloying and fit-up tolerances of the arc welding process.
Another application for HLAW is high-speed welding using the laser beam to stabilize the weld pool.
HLAW has been used on a wide variety of materials and thicknesses.
HLAW has been considered a laboratory or factory-welding process due to laser equipment limitations (i.e., size and cooling requirements).
Neither API 1104 nor Section IX of ASME has qualification requirements for HLAW or FSW.
Since the most common form of HLAW is a combination of GMAW and Laser Beam Welding (LBW), the proposed HLAW procedure qualification variables, as defined by ASME, are a combination of the applicable GMAW and laser-welding variables with a few additional variables specific to HLAW.
HLAW and FSW have been shown to improve productivity compared to typical arc welding processes.
He wrote: "The word Law in local place names derives from the Anglo-Saxon hlaw, which means rounded hill, and was often applied to a hill with an ancient barrow or tumulus on its summit."
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