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Hello Bob, There are a couple of different alloys used by radiator shops. For the application that you have described, a low temp solder with a low acid flux that has affinity to the metals you mentioned would work quite well. The low acid flux will be helpful where tinning is a must. Tinning compounds are also useful, especially for use with special applications of electrical connections involving stainless steel where acid is not desired. There are products available with the silver brazing alloy designation for use in those riveted areas you mentioned. The bond temps are lower than copper based brazing alloys but higher than solders that contain no silver.I have addressed these products and included part numbers for my brand in my response to the e-mail you sent me this morning. For the white metals like aluminum, or for joinig aluminum to dissimilar metals, a special flux is used. In the case of low temp alloys like our #328, no flux is required. The alloy is self tinning on aluminum, magnesium, zinc, etc.
HTH,
Steve
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