The application of high-alloyed steel in vehicle structures welding solutions

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The application of high-alloyed steel in vehicle structures welding solutions

Herold, H. / Pieschel, J. / Jüttner, S. / Müller, R. / Sovetchenko, P.

The application of high-strength steels in vehicle structures is an obvious choice in view of increased vehicle safety requirements and the trend towards harmonising lightweight engineering and recycling in order to conserve natural resources. As a rule, however, the weldability of such materials is not always guaranteed. In this study the use of CrMnNi steel (material number 1.4376) was investigated, regarding special manufacturing requirements due to the material, the possibility of distortion and the tendency of corrosion. Considering material structure and mechanical properties recommondations are given to optimize operating conditions (heat input, use of consumables). With regard to corrosion behaviour, gap corrosion should be seen as the most important aspect. Gaps must be avoided or protected. Joints should be welded as cleanly as possible, since end craters and joining defects are sources of corrosion. The use of copper-based solders is not advisable. In order to improve corrosion resistance, temper colour should be avoided or removed. The substitution of nickel by manganese as an alloy element means that material costs are relatively low. As high yield point and very good fatigue strength make this material interesting for use in vehicle structures, the authors claim that design, process, manufacturing sequence and equipment must be precisely and simultaneously coordinated when planning and building complex spaceframe structures made of steel 1.4376.