Research Projects

Laser and Hybrid Laser-Arc Welding

Laser welding (LW) is a non-contact fusion welding process with unique characteristics of localised heat-affected zone, minimized weld distortion as well as high welding speed. Hybrid laser-arc welding (HLAW) is a non-contact fusion welding process. During welding, a laser beam and an electric arc are applied simultaneously. In comparison with laser or arc welding process, HLAW can enhance both process efficiency and weld quality in welding of thick sections (>10 mm thick). SIMTech has developed automated LW and HLAW process capabilities together with process improvement, system integration, torch design as well as joint design.  

Laser butt welding of Ti-6Al-4V alloy


Laser welding of Cu alloys with different joint configurations: (a) T-Joint, (b) Coroner joint

  

Setup of the hybrid laser-arc welding system

Hybrid laser-arc welding of 10 mm thick stainless steel plates

 

Contact PersonBi Guijun(gjbi@SIMTech.a-star.edu.sg)
Benefits

SIMTech currently equips with a robotic 6 kW fibre laser welding system. The system will be able to perform laser welding in different welding positions, such as flat position (1F & 1G), horizontal position (2F & 2G), vertical position (3F & 3G) and horizontal rolled position. The same system can be modified for hybrid laser-arc welding. A tungsten inert gas welder, an automatic wire feeder are integrated to the laser welding system.  Welding of similar/dissimilar materials in different joint configurations, such as butt joint, lap joint, corner joint and T-joint can be achieved.  SIMTech has established strong welding capabilities in similar and dissimilar materials, such as ferrous steels, Ti alloys, Al alloys and Cu alloys.

The key advantages of LW and HLAW include:

  • Single pass deep penetration welding

  • High welding speed

  • Wide gap tolerance

  • Less welding distortion

  • Strong weld strength

  • Good corrosion resistance

  • High process efficiency

SIMTech has strong expertise in laser welding and hybrid laser-arc welding for process development, joint design, weld quality evaluation, post-welding heat treatment, system design & integration as well as welding fixture design.

Patents / Awards / Achievements / Differentiation

 

Publications

  • H. C. Chen, G. Bi, M. L. Nai, J. Wei: Enhanced Welding Efficiency in Laser Welding of Highly Reflective Pure Copper, Journal of Materials Processing Technology, 2015, Vol. 216, 287-293.

  • H. C. Chen, G. Bi, M. L. Nai, J. Wei: Influence of Surface Condition in Fiber Laser Welding of Pure Copper, International Congress on Applications of Lasers & Electro-Optics (ICALEO), Anaheim, California, USA, 09/2012.

Applications

Laser welding and hybrid laser-arc welding can be applied to weld thick sections into different joint configurations, such as butt joint, lap joint, T-joint and corner joint, in Oil & Gas, Maritime, Shipyard, automotive and structure industries.