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Avoiding hot cracking by induction based change of thermal strains during laser welding

: Göbel, G.; Brenner, B.

Ostendorf, A.:
ICALEO 2006, 25th International Congress on Applications of Lasers & Electro Optics. Congress proceedings. CD-ROM : October 30 - November 2, Scottsdale, AZ, USA
Orlando, Fla.: LIA, 2006 (LIA 99)
ISBN: 0-912035-85-4
International Congress on Applications of Lasers and Electro Optics (ICALEO) <25, 2006, Scottsdale/Ariz.>
Fraunhofer IWS ()

Hot cracking in welding is still an unresolved problem for a wide range of materials. Restricting the chem. compn. usually helps to reduce this problem, e.g. limiting the sulfur content on steels to very low levels. But for industrial applications such addnl. restrictions on the material norm are very obstructive. Furthermore some steels grades like free cutting steels contain addnl. sulfur which counteracts this approach. Therefore a new effective technol. was developed to reduce the cracks without regard to the compn.: The thermo-mech. reason for the hot cracks, the thermal stresses in the weld is counteracted. Vols. next to the weld are directly and effectively heated by induction in such a way that their thermal expansion reduces the weld strain during the crit. stages of the solidification. This technol. was successfully tested on strongly hot cracking sensitive free cutting steel plates with thicknesses up to 6 mm. It will be shown that this technol. enables fully crac