Investigation of the composite strength of hybrid steel-steel semi-finished products manufactured by laser beam welding and friction welding

B-A Behrens,J Twiefel,A Chugreev,J Wallaschek,S Nothdurft,T Hassel,J Hermsdorf,M Mildebrath,S Kaierle,H Ohrdes,T Matthias

doi:10.1088/1757-899x/461/1/012049

Abstract

An ever-increasing demand for more effective products with lower weight, more compact design and extended functionality has led to the use of material combinations with locally adapted properties instead of mono-materials. The Collaborative Research Centre (CRC) 1153 “Tailored Forming” at LUH addresses this topic with the aim to develop hybrid bulk-metal components on the basis of a new, tailored production process using joined semi-finished products. In contrast to existing manufacturing processes for hybrid bulk-metal components where the joining takes place during the forming process or at the end of the production chain, CRC 1153 uses tailor-made semi-finished products which are joined before the forming process. This contribution focuses on the production of hybrid semi-finished products from a steel-steel (C22.8 and 41Cr4) material combination by means of laser beam as well as friction welding. The effects of additional ultrasonic coupling into the weld-pool are presented for laser beam joining and a positive effect on the weld pool was observed. Furthermore, the resulting properties of the joining zone are investigated by uniaxial tensile tests at room temperature and metallographic analyses of the respective manufacturing processes. The friction welding proved to be a very robust process for the production of semi-finished steel-steel products.

Highlights

Introduction and motivationThe desire for a reduced resource usage and an increased component as well as production process efficiency gives rise to an enhanced demand for adapted components and adjusted processes
The Collaborative Research Centre (CRC) 1153 "Tailored Forming" at LUH addresses this topic with the aim to develop hybrid bulk-metal components on the basis of a new, tailored production process using joined semi-finished products
In contrast to existing manufacturing processes for hybrid bulk-metal components where the joining takes place during the forming process or at the end of the production chain, CRC 1153 uses tailor-made semi-finished products which are joined before the forming process

Summary

Introduction

The desire for a reduced resource usage and an increased component as well as production process efficiency gives rise to an enhanced demand for adapted components and adjusted processes These components need to offer locally customized areas for different stresses and load conditions. The use of more expensive, more difficult to process and higher alloyed steels can be reduced in combination with lower grade steels. For this approach, a joining process for the two similar materials has to take place. The impact of the ultrasound amplitude on the shape of the weld reinforcement, the crack area and the hardness peak value in the weld was shown before [1]. This indicates the ultrasound assisted laser beam welding as an appropriate

Methods

Results

Conclusion