As power sources for arc welding are continually developed, the importance of arc welding with a heat input that can temporally be free modulated increases. Process models obtained from measured data are the basis for this. Problems occurring in fusion welding processes are mainly hot cracks [3]. The possibilities of regulating modern power sources lead to control of cooling and solidification conditions and help adjusting them to the metallurgy. By using modern power sources for pulsed welding with dynamic control of the arc the heat input into the material as well as the resulting effects like high Marangoni values, melting pool movement and strong local sub-cooling of the melt were investigated. Thereby an enlargement of the application range of arc welding is possible and thus joining of materials and material combinations which are so far estimated as not suitable for arc welding.
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