GMA single wire brazing welding is well established for manufacturing, particularly in the thin sheet fabricating industry. Tandem brazing, and particularly filet brazing, are still hardly used by the industry. Both variations include the advantages of single wire brazing and they allow the considerable increase of the joining speed with, at the same time, higher component tolerances. Disadvantageous, however, is the larger design of the torch and the multitude of parameters for the setting of the tandem process. The aim of this report is to give a short introduction into the specific possibilities of the individual methods and also to compare them with one another. In filet brazing the square electrode causes the restricted three-dimensional flexibility. The achievable mechanical strength properties in GMA brazing with filler metals on a copper base are comparable to the strength properties of welded specimen. Under static and also under dynamic load the properties of welded joints are obtained. Sometimes the mechanical strength properties after brazing are by reason of the lesser thermal influence of the base metal even higher than after welding. It was demonstrated that the seam strength depends on the applied quantity of the solder. The strength increases with the increased solder quantity. Larger seam volumes mean, however, also an increased energy input into the base metal and thus augmented solder melting which leads to strong intermixture of base and filler metal. The higher ferrite content in the seam structure leads to increased susceptibility to corrosion which may have an overproportional negative effect on the mechanical strength properties. Emission values for single wire and tandem brazing do not exceed the statutory limiting values. Quantitatively, the tandem process has higher emissions than the single wire process. The higher values are mainly caused by higher tin emissions which are generated by the wider seam formation in the tandem process.
Latest developments and applications of GMA brazing
2004
11 Seiten, 14 Bilder, 8 Quellen
Conference paper
English
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