PreQ ESD - 2.18 Hard soldering

Brazing

Joining steel together using spelter

spelter

soldering that is made of brass

spelter melting point

870 degrees

Heating up spelter

using a gas blowtorch attached to a brazing hearth, or by an oxyacetylene torch.

Why are joints and wires needed

the flame is powerful and can move loose sections of steel

Brazing flux ingredients

paste made from Borax and water to prevent to prevent it from being blown away by the flame

Why bricks are placed

they deflect heat

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Brazing Hearth

Silver soldering ingredients

copper, zinc and silver

Silver soldering use

joining brass, copper, nickel and pure silver

Easy flow temp

between 625C and 690C

Medium temp

between 690C and 725C

Hard temp

725C and 800C

Different grade uses

each joint melts at a lower temperature than the last, so earlier joints stay set.

Easy-flow

flux for silver soldering which works at a lower temp than brazing flux