Controlling the fumes from the bonding together of two pieces of metal, the joint being created by a layer of molten alloy, the flow of which is assisted by a flux.

The bonding together of two pieces of metal, the joint being created by a layer of molten alloy, the flow of which is assisted by a flux.

Finely-ground borosilicate glass (coloured by trace metallic compounds) which melts at 800 to 820 °C is fused to the surface of certain metals.

Finely-ground borosilicate glass (coloured by trace metallic compounds) which melts at 800 to 820 °C is fused to the surface of certain metals. Kilns may be either electric or gas fired but some work can be done with a gas torch.