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ESAB at the 62nd Annual Assembly and Intl. Conference of the IIW
Singapore
ESAB's Global Welding Applications Manager Lars-Erik Stridh is participating at the conference and making a presentation on the themes "ESW strip cladding of pipes" and "The welding of the longitidunal joint with hybridlaser".
The presentation abstracts:
Author: Lars-Erik Stridh, IWE, Global Welding Application Manager, ESAB AB
ESW STRIP CLADDING OF PIPES
Electro Slag Welding with strip material is to be preferred in comparison with Submerged Arc Welding. The deposition rate increases with 60 – 80%, gives less dilution with the base material and increases the welding speed with 50 – 100%. Using a 30 mm wide strip, the minimum pipe diameter that is weldable is 250mm for longitudinal welding and 350 mm for circumferential welding. The number of steel grades that are required to achieve the desired surface properties results in many different strip analyses. In order to facilitate this, research and development has been done with the flux. The aim is to reduce the amount of strip-qualities and add alloying elements from the flux. The paper describes how this is possible with Ni, FeCr and FeMo, and shows the corrosion properties.
HYBRID LASER FOR WELDING OF LONGITUDINAL SEAM
A new technique to weld the longitudinal seam of “raiser-pipes” is presented. The welding is done with HybridLaser combining a CO2 laser with MAG process. The welding with conventional technique of a 12 m long pipe, wall thickness 16 mm takes approximately 4.5 hrs. With the new process, it can be done in 15 minutes, maintaining the quality and mechanical properties. This opens up many possibilities for pipe welding.
