JOINT STRENGTH AND FRACTURE ANALYSIS OF ARC BRAZING WITH Cu-BASED FILLER METALS

Abstract

Abstract: TIG brazing for joining A3 Steel sheets and 1Cr18Ni9Ti stainless steel with Cu3Si1Mn and 56Cu8Mn26Zn brazing filler metal is investigated. The experiment results indicate the Si and Mn rich band is produced at the interface of filler metal and based metal. XRD analysis shows that Si existed as Fe2Si and Mn in the form of solid solution. Tensile testing specimens using Cu3Si1Mn and 56Cu8Mn26Zn as filler metal fractured at the base metal with the joint strength of 308.2 MPa to 308.7 MPa. The joint specimens of stainless steel 1Cr18Ni9Ti fractured in the brazing seam with the strength of 331.5 MPa and 382.9 MPa. Tensile fracture analysis shows that the fracture area is originated at the bottom of lap brazing seam, which is brittle fracture composed of the components of base metal and filler metal, and ended in the brazing seam (Cu3Si1Mn filler metal) or at the vicinity of interface (Cu3Si1Mn filler metal) which is ductile fracture.

Key words: Arc brazing, Cu-based filler metal, Fracture, Joint strength

CLC Number:

TG454

Yu Zhishui;Qian Yiyu;Wang Fengjiang;Qi Kai;Li Xiaoquan. JOINT STRENGTH AND FRACTURE ANALYSIS OF ARC BRAZING WITH Cu-BASED FILLER METALS[J]. , 2001, 37(10): 88-92.

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JOINT STRENGTH AND FRACTURE ANALYSIS OF ARC BRAZING WITH Cu-BASED FILLER METALS

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