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Laser hybrid welding technology provides a number of advantages, which in the previous decade have promoted its implementation in different branches of industry such as automotive manufacturing, shipbuilding and power generation. Some examples of the applications of laser hybrid welding are reviewed to demonstrate the technological and economic potential of this technology. The main objective of this chapter is to show some of the benefits and limitations of the process and to give some examples of how the number of applications could rise, taking into account the advantages of the new laser systems, optical components, arc power sources and sensor systems available nowadays.
Laser-GMA-hybrid welding of longitudinally welded large-diameter pipes of grades API- X80/ X120
(2015)
Potentials of the hybrid laser arc welding processes were investigated regarding reliable production of longitudinal welds of high strength pipe steels X80 and X120
Hybrid laser arc welding of the root pass:
Significant reduction in the weld cross section – savings of filler material
Lower heat input into the base material - improvement of mechanical properties of the weld joint
The arc type does not have any influence on the character of dilution in the laser part of the hybrid weld
14 mm deep root face was considered as optimum. No penetration of the filler material could be detected beyond this depth limit
Metal powder filler wires, micro alloyed with Ni and partly with Cr and Mo, guaranteed sufficient Charpy impact toughness at low temperature for the both investigated materials:
Hybrid laser arc welding is a very efficient process for the root pass in multi-pass welding and opens a large technical and economic potential for the manufacture of large pipes