The photos appears as it was brazed or silver soldered, however, the filler material did not extend under the flange and therefor only the perimeter was holding it together. I agree with a radiator shop repair.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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