You can set-up a rsw procedure by testing,, Also some of the equipment manufacturers have set-up data to produce correct size spot welds,, I am looking for general rules which groven spot welding.. Per AWS code..
lawrence , the d1.3-89 that i have has sample (pqr) ,(wps) and welder/welder operator forms . You should get a newer version of this . d1.3-98 is the most current listed in aws 2006 catalog . you should be able to get that from your local aws section . then have your qc manager have it developed to your use . ? where are you at ? good luck . willie