Brazing TCSPM jaw (Sept. 2016)

Présentation au sujet: "Brazing TCSPM jaw (Sept. 2016)"— Transcription de la présentation:

1 Brazing TCSPM jaw (Sept. 2016)
F. Motschmann, A. Gerardin

2 TCSPM jaw brazing Preparation Surface treatment:
Glidcop: Cu/Ni-plating CuNi: Chemical etching Filler material: SCP1 (68Ag/27Cu/5Pd), 50 µm-foil Alignment Furnace brazing

3 TCSPM jaw brazing Result of first brazing:
Large contact areas not covered by filler material General poor wetting on CuNi-tube -> Second brazing step with added BFM at higher temperatures to exclude poor wetting by too cold piece-temperature No significant change in appearance Tube started to peel of during subsequent mounting process Practically no wetting of the CuNi-tubes all over the part Appeareance of the Glidcop-jaw in accordance with expectations

4 TCSPM jaw brazing Brazing Test - Evaluation
Chemical Analysis CuNi (EDX, XPS) Composition indicates no detrimental species in the bulk material (Mn/Si traces?) Brazing Tests wettability Norm. mass percent (%) Spectrum Si Mn Fe Ni Cu Tube ancien # Tube ancien # Tube nouveau # Tube nouveau # Sur plaque en cuivre OFE : 1/ Tube nouvelle livraison, non décapé, usiné une face, non rayonné 2/ Tube ancienne livraison, non décapé, surfacé P600 Sur plaque en Glidcop (cuivrage 20 µm + nickelage 7 µm) : 3/ Tube nouvelle livraison, non décapé, usiné une face, non rayonné 4/ Tube nouvelle livraison, décapé, usiné une face, rayonné 5/ Tube nouvelle livraison, décapé, usiné une face, non rayonné

5 TCSPM jaw brazing Brazing Test - Evaluation
Brazing of current CuNi/former material: good result Brazing of etched CuNi-tube (current lot) to plated Glidcop: good result

6 TCSPM jaw brazing Brazing Test - Evaluation
Brazing of non-etched CuNi-tube (current lot): (partially) poor wetting

7 TCSPM jaw brazing Cu 3 4 5 Brazing Test - Evaluation
Wetting test of filler material -> wetting sufficient on every sample -> etched pieces show slightly better wettability Cu 3 4 Cu/ Cuivre OFE Sur plaque en Glidcop (cuivrage 20 µm + nickelage 7 µm) : 3/ Tube nouvelle livraison, non décapé, usiné une face, non rayonné 4/ Tube nouvelle livraison, décapé, usiné une face, rayonné 5/ Tube nouvelle livraison, décapé, usiné une face, non rayonné 5

8 TCSPM jaw brazing Conclusions
Test brazing shows principally good results for the standard procedure (Cu/Ni-plated Glidcop, CuNi etched) Efficiency of etching process for the long tubes might have been not sufficient (other undiscovered effects that influence the surface quality of the CuNi-tube) Further approach Further etching of the CuNi-tubes before next brazing process Fast solution: Brazing with active BFM (tooling/spacers could be brazed to the structure, definitely no solution for future joining) Sophisticated solution (but maybe a bit longer): Wait for Metallurgy investigation; wetting test on real part before actual brazing

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