• Enzinger, Norbert
• Treiber, Arpad

Abstract

The JOIN-B5 project titled “Bimetal Strip-Wire Twin Welding” is executed in the network of excellence JOIN, funded by Federal Ministry of Economics and Labour of the Republic of Austria.<br/>Based on a comprehensive literature review the production of the bimetal strip by the cold rolling process was chosen. The test specimen, butt welded of 2mm thick metal sheets (steel-aluminium) using the bimetal strip, were metallographicaly examined. The presence of intermetallic phases (IMP) was confirmed at the crack locations by<br/>means of SEM-EDX analysis. It was also confirmed that the IMP growth took place at the primary (bimetal) joint interface caused by the thermal effect of the secondary (laser) welding.<br/>The experimental work was supported by modelling activities. The parameters used for the finite element (FE) simulation were selected in accordance with the real laser welding. The comparison of the calculated temperatures with the measured ones showed a satisfactory correspondence. The (FE) simulation makes it possible to predict the maximum temperature (caused by welding) and also its duration at some important areas of our joint model.<br/>For the following investigations a new bimetal has to be procured with a changed geometry (strip thickness) and some alternative welding procedure parameters also have to be tested (less heat input).<br/>Based on the interim conclusions in the framework of the JOIN-B5 project the next steps of the planed research work are already being performed

Topics

• impedance spectroscopy
• phase
• scanning electron microscopy
• simulation
• aluminium
• laser emission spectroscopy
• crack
• steel
• Energy-dispersive X-ray spectroscopy
• cold rolling
• intermetallic
• wire