Details
| Original language | English |
|---|---|
| Pages (from-to) | 248-257 |
| Number of pages | 10 |
| Journal | Welding and Cutting |
| Volume | 15 |
| Issue number | 4 |
| Publication status | Published - 2016 |
Abstract
Keywords
- Brazing, Material questions
ASJC Scopus subject areas
- Engineering(all)
- Mechanics of Materials
- Engineering(all)
- Mechanical Engineering
- Materials Science(all)
- Metals and Alloys
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In: Welding and Cutting, Vol. 15, No. 4, 2016, p. 248-257.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Development of processes for flux-free gas-shielded brazing between 650°C and 850°C utilising silane-doped process gases
AU - Holländer, Ulrich
AU - Weber, Felix
AU - Möhwald, Kai
AU - Maier, Jürgen
N1 - Funding Information: The IGF Project 17.884 N/DVS Number 07.074 of the research association "Forschungsvereinigung Schweißen und verwandte Verfahren des DVS, Aachener Straße 172, 40223 Düsseldorf" was, on the basis of a resolution of the German Bundestag, promoted by the German Ministry of Economic Affairs and Energy via the Federation of Industrial Research Associations (AiF) within the framework of the programme for the promotion of joint industrial research and development (IGF).
PY - 2016
Y1 - 2016
N2 - This article relates to the development of flux-free brazing processes in the temperature range between 650°C and 850°C using nitrogen doped with monosilane (SiH4) as the process gas. The gaseous SiH4 is an agent which is highly reactive, exerts a strongly reducing effect and, when admixed to the inert gas, quantitatively reacts with the existing residual oxygen and residual water and thus ensures oxygen-free process conditions as the basic prerequisite for a flux-free gas-shielded brazing process. The objective of the project was to establish the prerequisites with regard to materials science, the necessary process conditions as well as the process limits for the flux-free brazing of relevant construction materials made of copper alloys and steels in similar and mixed joints with silver-based and copper-based brazing filler metal. For this purpose, an investigation was conducted into the procedures for brazing in a continuous shielding gas furnace and gas-shielded induction brazing which, in the case of a changeover to a flux-free brazing procedure, are appropriate as alternatives to the flame brazing utilised until now. In order to establish suitable process parameters for flux-free brazing, wetting and brazing tests were performed and the tensile shear strengths of brazed standardised test pieces were determined. The obtained results show that flux-free brazing in a reliable process is possible in SiH4-doped nitrogen in the specified temperature range for all the investigated copper materials and steels if process conditions and brazing filler metal adjusted to the materials are utilised.
AB - This article relates to the development of flux-free brazing processes in the temperature range between 650°C and 850°C using nitrogen doped with monosilane (SiH4) as the process gas. The gaseous SiH4 is an agent which is highly reactive, exerts a strongly reducing effect and, when admixed to the inert gas, quantitatively reacts with the existing residual oxygen and residual water and thus ensures oxygen-free process conditions as the basic prerequisite for a flux-free gas-shielded brazing process. The objective of the project was to establish the prerequisites with regard to materials science, the necessary process conditions as well as the process limits for the flux-free brazing of relevant construction materials made of copper alloys and steels in similar and mixed joints with silver-based and copper-based brazing filler metal. For this purpose, an investigation was conducted into the procedures for brazing in a continuous shielding gas furnace and gas-shielded induction brazing which, in the case of a changeover to a flux-free brazing procedure, are appropriate as alternatives to the flame brazing utilised until now. In order to establish suitable process parameters for flux-free brazing, wetting and brazing tests were performed and the tensile shear strengths of brazed standardised test pieces were determined. The obtained results show that flux-free brazing in a reliable process is possible in SiH4-doped nitrogen in the specified temperature range for all the investigated copper materials and steels if process conditions and brazing filler metal adjusted to the materials are utilised.
KW - Brazing
KW - Material questions
UR - http://www.scopus.com/inward/record.url?scp=84994052120&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:84994052120
VL - 15
SP - 248
EP - 257
JO - Welding and Cutting
JF - Welding and Cutting
SN - 1612-3433
IS - 4
ER -