Welding With Brass Backing. Zinc has a really low melting point. For a joint that requires backgouging the material used for backing is non-essential.
In my experience if the metal is rusted enough to perforate the whole area is junk. This is highly important as having enough oxygen ensures that zinc fumes are not. It helps to ensure that 100 of the base metals thickness is fused by the weld full penetration.
Paint this onto the brass surfaces that you intend to weld.
If possible the weld metal should be deposited with a weave approximately three times the width of the electrode. Copper is mentioned in 510. Below are some of the items youll need gather up before you learn how to weld brass to brass. Its function is to facilitate complete joint penetration.