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What Is Flux Used For In Brazing? Define Welding Brazing

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What is flux used for in brazing?

What is flux used for in brazing?

In metallurgy, a flux (derived from Latin fluxus meaning “flow”) is a chemical cleaning agent, flowing agent, or purifying agent. As cleaning agents, fluxes facilitate soldering, brazing, and welding by removing oxidation from the metals to be joined.


Can you use a propane torch for brazing?

Brazing with Propane. Here is the answer to whether you can braze with a propane / air torch. You can but you have to control the environment so that the heat loss to the atmosphere and parts is lower than the heat being put into the braze joint. Here is a standard handy torch.

What is flux used for in brazing?
  • What is the temperature of brazing?

    We can define brazing as the joining of metals through the use of a heat and a filler metal. In this process the melting temperature of the brazing filler metal is above 840° F (450° C), but in all cases below the melting point of the metals being joined.

  • Can steel be welded to bronze?

    Since the bronze filler metal is extremely ductile, it can absorb stresses created during cooling which might, in the case of a cast iron fusion weld, cause cracking of the base metal or the weld. Steel can be braze welded to cast iron. Copper can be joined to brass by a braze weld.

  • How hot is a propane torch?

    An air-only torch will burn at around 1,995 °C (3,623 °F), less if heat loss to the surroundings is taken into account. Oxygen-fed torches can be much hotter at up to 2,820 °C (5,110 °F), depending on the fuel-oxygen ratio.


What is oxy acetylene brazing?

The heating method most commonly used in brazing a single assembly is the hand held torch. A variety of fuels are available - natural gas, acetylene, propane, propylene, etc., combusted with either oxygen or air. (Most popular is still the oxy/acetylene mixture.)

  • Can copper be Weld?

    Oxygen-free copper is the most commonly available and readily weldable copper. Avoid alloys. While copper alloys can be welded, each alloy will weld differently from another. An impurity can cause different relativities of thermal expansion, thermal conductivity, or electrical conductivity.

  • Why is solder used to join metals?

    Soft solder melts at about 200°C. The solder flows into the heated metal along the joint, distributes itself by capillary action, and grips the two pieces together when it all cools. Hard solder melts at 625°C, and is used for stronger joints.

  • How hot is an oxy acetylene torch?

    "The temperature of the flame can reach as high as 6,300 (3,480)." Thomas Wilson created the oxyacetylene torch in 1903. He combined both pure oxygen (99.5%) and acetylene in proper proportions to yield a flame of about 3,480 degrees Celsius. Oxyacetylene the only gas mixture that will burn hot enough to cut steel.

Updated: 26th October 2019

What is flux used for in brazing?

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