Silver brazing alloys will not flow over or bond to oxides. Oily or greasy surfaces repel fluxes, leaving bare spots which oxidize and result in voids and inclusions.
因为银钎焊合金并不会流过或粘接在氧化物上，而油污的表面及暴露的、容易氧化和导致空隙和杂物排斥焊剂。
2
The filler metals and fluxes suitabled for 2A50 aluminum alloy brazing were selected according to the feature of 2A50 aluminum alloy and the test of spreadability and clearance fillabitity.