Question

Which of the following material is not used as a flux in forge welding?

(a) 2 parts of borax with one part of sal-ammoniac

(b) Quartz sand

(c) Calcined borax

(d) 3 parts of borax with one part of sal-ammoniac

I have been asked this question by my school teacher while I was bunking the class.

Enquiry is from Smith Forging Operations topic in division Smithing and Forging of Casting-Forming-Welding II

Answer 1

The correct option is (a) 2 parts of borax with one part of sal-ammoniac

Best explanation: The metal which has to be welded, has to be first covered with flux. By covering it with flux, it cuts the metal from the air around and prevents from oxidation. The fluxes used for this purpose are quartz sand, calcined borax and 3 parts of borax with one part of sal-ammoniac.