Improved joining of hot-stamped parts

Eugen Stockburger carries out a test at the Institute of Forming Technology and Machines. (Source: IFUM)

IFUM | New options for conventional hot stamping: Researchers at IFUM intend to improve the joinability of hot-stamped car body parts in multi-sheet joints. This is achieved by local thinning and softening of the austenitised material.

Hot-stamped structural parts are a key factor in automotive lightweight design, where 22MnB5 steel has become an established material in the production of safety-relevant car body parts. An improved reliability of joining technology would even widen the range of application of hot-stamped parts.

Up to now, ultra-high-performance car body parts are thermally joined to other parts by spot welding. Problems arise from uneven weld lense formation with improper bonding in multi-sheet joints. The applicability of mechanical joining processes like riveting is also limited due to the high strength and hardness of the hot-stamped parts.

Researchers of the Institute of Forming Technology and Machines (IFUM) intend to improve the joinability of hot-stamped parts by local thinning and softening of the austenitised material. The result: improved thermal as well as mechanical joining techniques.

by Eugen Stockburger

Image gallery for this article

  • Eugen Stockburger carries out a test at the Institute of Forming Technology and Machines. (Source: IFUM)
  • Improved joining of hot-stamped steels (top sheet in green) in multi-sheet joints. (Source: IFUM)
  • Measured hardness and micrographs of locally thinned and softened blank. (Source: IFUM)
  • Numerical analysis for enhanced hot stamping by local thinning and softening. (Source: IFUM)
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