Main > Technology > Welding & brazing > Brazing & soldering > Brazing (Oxy-acetylene)
FOOF: Fuel - Oxygen - Oxygen - Fuel. This is the safety procedure for starting and finishing:
ON: Turn the Fuel knob on first, a small amount. Then turn on Oxygen, a smaller amount. Light the fuel. Add fuel and oxygen to get a very acute-angle blue flame, and hardly any yellow flame. The longer the tip, the hotter the point.
OFF: Turn down the Oxygen to create a yellow fuel-only flame. Turn off the Fuel.
kellyjones00 (593)
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Main > Technology > Welding & brazing > Brazing & soldering > Brazing (Oxy-acetylene)
Safety: If the lit fuel suddenly cuts out, you'll hear a pop, where only oxygen is emitted from the gas-axe. Cut the gases immediately: O-F. If your regulators are poor, and the flame reverses up, you may blow yourself up. Remember, never turn the fuel off before the oxygen!
kellyjones00 (593)
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Main > Technology > Welding & brazing > Jigs
Some useful items to create jigs: strong metal magnets, metal clamps, high-melting point metal-wire.
kellyjones00 (593)
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Main > Technology > Welding & brazing > Metals
Melting-points: See this table to compare various metals' strengths: link
kellyjones00 (593)
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Main > Technology > Welding & brazing > Brazing & soldering
Technique: For efficiency, heat along the metal pieces and filler rod, to the same temperature, such that the filler runs like lava up the join.
kellyjones00 (593)
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Main > Technology > Welding & brazing > Forgeweld
Blacksmithing: A good forge has a continuous supply of oxygen, heat-retaining properties, and is situated very close to the anvil.
kellyjones00 (593)
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Main > Technology > Welding & brazing > Forgeweld
Tempering: To keep metal in a 'good temper', the molecular structure needs to be uniformly soft. After beating and hardening at the anvil, heat it uniformly at the forge-fire, then quench in a water bath nearby. Repeat while working the metal.
kellyjones00 (593)
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Main > Technology > Welding & brazing > Forgeweld
Strength: For a uniform molecular structure, resistant to warping and stress-fractures, make sure the final product is uniformly heated and then quenched.
kellyjones00 (593)
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Main > Technology > Welding & brazing > Forgeweld
DIY backyard forge: There must be good ventilation. Saw off one-quarter (a corner) from 20-30 gallon drum, and fill the drum with ordinary blue-metal gravel. Clamp a gas-axe to point into the centre of the gravel bed. Use a railway sleeper as an anvil and a flat-head metal mallet as hammer.
kellyjones00 (593)
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Main > Technology > Welding & brazing > Brazing & soldering > Brazing (Oxy-acetylene)
Pre-brazing: Clean the areas to be joined until the original metal shines, using files and wire brush. Lightly apply flux to reduce oxidation, and let dry.
kellyjones00 (593)
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