Investigation of the Process- and System-Induced Activation of Material Reactions during Discontinuous High-Frequency Welding

Volker Wesling,Henning Wiche,Antonia Schram

doi:10.4028/www.scientific.net/amr.137.247

Volker Wesling, Henning Wiche + Show 1 more

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https://doi.org/10.4028/www.scientific.net/amr.137.247

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Abstract

Besides weldable component geometries for the high-frequency welding process also possible process and system induced activated material reactions during discontinuous high-frequency welding are presented in this paper. Among others such material reactions can be a locally limited thermal influence on the base metal, defined plastic derformations during the upsetting process as well as grain refinement in the weld seam, comparable to thermomechanical treatment during rolling for increasing strength or ductility.

Highlights

The fields of application and limits on applicability of discontinuous high-frequency welding have been investigated [6]
The effect of the orthogonal upset-pressure component was taken as basis for developing a calculation concept for estimating the HF weldability of planar work-pieces with nonlinear weld geometry
Simple and economical implementation is a characteristic advantage of this concept, since the time-consuming and expensive construction of clamping elements to match the weld geometry is not necessary

Summary

Introduction

The fields of application and limits on applicability of discontinuous high-frequency welding have been investigated [6]. The limiting geometry is determined as a function of the k value; with this geometry, the specific upset pressure which acts in the direction orthogonal to the joining surface decreases to the critical range between 25 and 30 N/mm or below. The pipe could even be pushed through the cross-section of the sheet in the joining zone, with consequent upsetting of the pipe end on the backing support For solving these problems, the present application was transformed to a task of edge welding two pipes by appropriate modifications. This example shows how the use of an auxiliary joining element in the form of a projecting collar allows the production of nodular elements by inductive high-frequency welding. The material must be sufficiently deformable for allowing implementation

Conclusions

Findings

Conclusions and outlook