- FITTING - The strongest joints are produced
with the closest fitting members. Make sure surfaces are smooth, free from burrs, fit
- CLEANING - Parts must be thoroughly
cleaned. Remove all oxides, dirt, and grease by buffing, sanding, or pickling.
- FLUXING - Cover all of the joint to protect
the metal against oxidation, thereby aiding the flow of the solder. To reduce the amount
of cleaning after soldering, it is advisable to flux the entire piece.
- JIGGING - Secure proper alignment of parts
and prevent their movement during the heating process. A jig should be made of as light a
gauge material as possible and with as little contact area as possible. Use a poor heat
conductor to avoid the loss of heat (DO NOT use copper or aluminum). When joining
different thicknesses of metal, preheat the heavier piece first to avoid overheating the
- HEATING - Use a soft flame and slowly,
uniformly heat the joint and surrounding metal before soldering. Continue heating until
the joint shows a dull red color. Use the color of the work to judge the temperature.
Concentrate the flame along the joint. Do not let the material get to a bright salmon red.
Let the heat of the parts to be joined flow the solder. Do not try to flow the solder with
the flame from the torch.
Temperature Guide by Color
First visible red - 900°F
Dull red - 1200°F
Cherry red - 1400°F
Bright salmon red - 1600°F