A Practical Approach for Increasing Penetration in Hybrid Laser-arc Welding of Steel

Farrokhi, Farhang; Kristiansen, Morten

doi:10.1016/j.phpro.2016.08.060

Cited by 5 publications

(3 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Joints with SM490A steel 25 and 50 mm thick were produced free of defects with a gap of 2.5 mm. An interesting result for industrial applications was observed by Farrokhi et al [79]. Higher values of welding speed were achieved using zero gap and laser process for cutting the edge surfaces.…”

Section: Joint Design and Edge Preparationmentioning

confidence: 85%

“…Thus, in order to achieve the full penetration of thicker plates, the technique of double sided welding (both sides of the workpiece) were also investigated. Farrokhi et al [79] have produced joints of 25 mm of S355J2 steel with a complete penetration using disk laser GMAW arc hybrid system in a double sided single pass (DS_SP) ( Table 11B). This technique was also employed to produce other joint with 30 mm with RQT701 steel using GMAW and CO 2 laser hybrid (Table 11G) [45].…”

Section: Macrostructurementioning

confidence: 99%

“…Imperfections of hybrid laser welding: (a) pores (reproduced from[75] with permission, Springer London, 2017), and (b) crack (reproduced from[79] with permission, Elsevier, 2016).…”

mentioning

confidence: 99%

See 2 more Smart Citations

Laser Hybrid Butt Welding of Large Thickness Naval Steel

Churiaque

Chludzinski

Porrúa-Lara³

et al. 2019

Metals

View full text Add to dashboard Cite

Plates joining is one of the first stage at large vessels manufacturing line, process conditioning the whole shipbuilding production. Laser Arc Hybrid Welding (LAHW) process is nowadays providing promising results for large thickness naval steel, being primarily used for welding plates with thicknesses between 6 to 15 mm, reaching up to 51 mm. In addition to this high penetration ability, LAHW allows increasing the production rates. Therefore, this technology is proposed as an alternative to conventional welding processes in shipbuilding, as it integrates the advantages of laser and arc welding, providing high process stability, high welding speed and penetration, narrow weld beads with a low heat input and good metallurgical properties. The present review reports the most representative investigation regarding the use of this technology to join large thickness flat panels of naval steel. It includes a summary of the most influential process variables, equipment characteristics, material properties, naval regulations, as well as microstructural characterisation and mechanical properties of joints. This review is thought to help readers from different backgrounds, covering from non-expert on welding or on naval sector, to industrial LAHW applicators and researchers. The industrial need of performing one single pass procedure to assure high quality welds of high thickness is suggested as one of the key aspects for future investigations.

show abstract

Section: Joint Design and Edge Preparationmentioning

confidence: 85%

Section: Macrostructurementioning

confidence: 99%

See 1 more Smart Citation

Laser Hybrid Butt Welding of Large Thickness Naval Steel

Churiaque

Chludzinski

Porrúa-Lara³

et al. 2019

Metals

View full text Add to dashboard Cite

show abstract

Expansion of laser–arc hybrid welding to horizontal and vertical-up welding

Uemura

Gotoh

Uchino³

2022

Weld World

View full text Add to dashboard Cite

Laser-arc hybrid welding (LAHW) is an advanced welding method that combines arc welding and laser welding and can achieve deep penetration and the reduction of welding deformation compared with conventional arc welding. As with other welding techniques, it is common to target the flat position (PA) as the welding position. However, the expansion of the applicable positions enables the application of highquality welded joints fabricated by LAHW to many welded joints in large steel structures. This study used the LAHW system with a robot manipulator to establish weldability in the horizontal position (PC) and the vertical-up position (PF) to expand the applicable range of LAHW in large steel structures. Suitable LAHW conditions for fabricating the butt-welded joint with a welding length of 1,000 mm for these positions were established through various investigations, including molten pool observation. Finally, the quality of these joints was evaluated in accordance with the Laser Arc Hybrid Welding Guidelines (ClassNK) of Nippon Kaiji Kyokai, and it was confirmed that the joints satisfy the required standards.

show abstract