Svetskommissionen är en teknisk branschorganisation för fogande industri. Vi jobbar med standardisering, forskning och utbildning. Svetskommissionens viktigaste uppgift är att verka för våra medlemmars intressen.
Joakim Hedegård, Sophie Caddéo
Arc welding of hot dip zinc-coated steel sheets faces a number of challenges, such as minimising the generation of spatter, blowholes and pitting. The zinc being vaporised during the welding process causes all this. These problems were focused on in a project with the task to seek ways to improve the weldability. This is the final report of the project. As a first step, a literature study was conducted to investigate reported problems and possibilities for MAG welding of zinc-coated steel sheets. To compare different welding techniques at hand, the literature study also contains papers regarding MIG-brazing. As a second part, different ways to improve the weldability of zinc-coated steel sheets were evaluated. Welding trials were performed on lap joints with no gap between the plates because it was considered to be the worst case. In a first test series the heat input was minimised. A second series evaluated the influence of the welding speed and shielding gases, and a third series studied welding with a specially developed flux cored wire “SAFDUAL-Zn".
The results showed that minimised heat input (high weld speed) can, with some reservations, be used on thinner Zn-coatings. By increasing the heat input and creating a large weld pool (reduced weld speed) it is possible to weld Zn-coatings of different thicknesses. The weld quality and welding speed is, however, very much influenced by the Zn-coating thickness. Better results, also for thicker Zn-coatings, were achieved with the designated flux cored wire “SAFDUAL-Zn".
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