Abstract
This paper presents the study of the process of assembling metal sheets by using brazing of joints through cold welding. The processing technology is a normal drawing procedure. This paper explains schematically the drawing process. Aluminium and copper zinc alloys were used in order to observe the increase of the age-hardening response in brazed alloys. Of great importance is the filler material and especially the way in which it diffuses in the base materials. In this study, the material used was correctly selected, the bimetallic sheets were brazed properly and the behavior of the assembled sheets was according to standards.
Highlights
The drawing process consists in using a combination of deep drawing and stretch forming, in order to control how the material flows into the blank holder
An accepted method is to apply to the bimetallic brazed sheets a non-uniform layer of lubricant; the quantity of the lubricant and whether there is a need for additional lubrication prior to drawing depends on the processed area
We have studied the way in which bimetallic brazed parts may be drawn through cold welding and a normal drawing procedure
Summary
The drawing process consists in using a combination of deep drawing and stretch forming, in order to control how the material flows into the blank holder. The drawing methods are varied, but they can be applied individually or in combinations: the blank form, using lubricants, crimping clamps, influencing the frictional forces. An accepted method is to apply to the bimetallic brazed sheets a non-uniform layer of lubricant; the quantity of the lubricant and whether there is a need for additional lubrication prior to drawing depends on the processed area. In the drawing process, it is possible to reduce the blank holder force by increasing the pressure on the punch. By regulating the pressure on the blank holder, it is possible to control the flow of material under it; this effect is obtained by varying the distance between the blank holder and the drawing ring [4]
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