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Brazing Explained – Definition, Process, Types

By September 13, 2022Uncategorized

Brazing is a course of action that joins two or extra metal surfaces by allowing molten metal circulation into the joint. The filler metal has a decreased melting temperature than the sections to be joined to maintain the workpieces from melting.

Despite the fact that brazing is just one of the oldest becoming a member of techniques, it is however applied nowadays for a excellent cause.

What Is Brazing?

Brazing joins metal surfaces with each other with a filler metal which has a small melting place. The process utilizes capillary action wherein the homogenous liquid circulation of the filler content bonds with the foundation metals.

A exceptional good quality in the brazing procedure is that it keeps the mechanical qualities of the metals which are helpful in applications these types of as silver brazing or other very similar metals.

Brazing Course of action

1 of the most critical steps in the metal joining procedure is the cleansing of the base metal surfaces. Emery fabric or wire brush are both good resources to remove contaminants.

Having calculated joint gaps for the liquid filler metal to realize floor rigidity with the workpiece, the brazing operation begins with adequately positioning the assembly. A torch is usually applied to slowly and gradually warmth the workpiece’s metal floor and filler metal into its brazing temperature.

As the filler metal liquefies, capillary motion allows it pass as a result of the tight spaces, thus forming a bond involving the floor of the foundation metals.

The brazed joints are fashioned as it cools down with the assembly.


These are the metals that are generally joined by brazing:

  1. Aluminium

  2. Cast iron

  3. Magnesium

  4. Copper and copper alloys

  5. Silver

Filler metal requirements

  1. After the molten flux and filler metal solidify, the brazed joint ought to have the envisioned mechanical qualities.

  2. Brazing temperatures should efficiently obtain a good liquid stream from the molten braze alloy into the joints.

  3. Filler metals will have to accomplish appropriate wetting circumstances in order to make powerful bonds.

Variance In between Brazing, Soldering & Welding

Brazing works by using capillary motion to be a part of different metal surfaces. It makes use of a course of action referred to as wetting, whereby the foundation metals are bonded with a melted filler content. The brazing filler metal has a melting issue previously mentioned 450 °C.

Soldering utilizes filler metals that have a melting position beneath 450 °C. While soldering utilizes the same principle as brazing, the principal variance lies in their performing temperatures and hence in the power of the developed joint.

Welding also melts the workpieces in addition to the filler metal. This permits the generation of much better bonds than with brazing. Procedures these as TIG, MIG, and stick welding function at considerably greater temperatures.

Braze welding is a type of MIG/Magazine welding. The big difference lies in the melting point of the filler wires which is noticeably reduced than the father or mother metal. The filler metal is deposited in purchase to fill in the gaps by means of capillary motion. There is no considerable fusion of the parent metals but it might come about in a confined quantity.

Diverse Methods of Brazing

Brazing makes use of various heating solutions to accommodate a wide range of purposes and applications. Warmth can either be used specifically to a joint (localised) or to the full workpiece (diffuse heating).

Localised Heating Tactics

Torch brazing – Combusted gasoline gas is shaped by burning acetylene, propane, or hydrogen with air to warmth and soften the filler metal. Flux is necessary although using this method in order to safeguard the joint, which demands article-cleanup later on on. Torch brazing is generally applied for modest manufacturing assemblies wherever metal body weight is unequal.

Induction brazing – High-frequency alternating existing is provided into a coil to achieve brazing temperature, which heats the workpiece and melts the filler content.

Resistance brazing – Heat is created from the electrical resistance of the brazing alloy, which is fantastic for highly conductive metals. This heating strategy is finest suited for producing straightforward joints involving metals.

Diffuse Heating Techniques

Furnace brazing – Fuel firing or heating things are utilized to convey the furnace to the wished-for temperature. The brazing filler metal is applied to the surfaces to be joined and then the entire assembly is put into the furnace and introduced to brazing temperature. Furnace brazing enables precision in managing the heating and cooling cycles of the metals. The method is frequently performed in a vacuum to guard the braze alloy from atmospheric situations. This also negates the will need for flux defense.

Dip brazing – The workpiece or assembly is immersed in a bathtub of molten filler metal (molten metal bathtub brazing) or molten salt (chemical bathtub dip brazing). Brazing flux is applied to the pieces to stop oxidation. The assembly can be eliminated at the time the molten brazing filler metal has solidified.

Positive aspects

  1. Can join dissimilar metals, compared with most welding approaches.

  2. High generation fees.

  3. Consumes significantly less energy than welding.

  4. Produces cleaner joints compared to most welding procedures.

  5. Foundation metals never soften, preserving their shape and mechanical homes.


  1. Weaker outcomes in contrast to welded joints.

  2. Simply cannot sign up for factors operated at significant temperatures.

  3. Calls for limited, uniform joint gaps to accomplish capillary motion.

  4. Unclean or contaminated metals could result in leaky joints.

Brazing is utilised in a huge selection of industries because of to its versatility and capability to be a part of dissimilar metals. Fractory’s cautiously chosen producing partners have working experience and know-how in this industry as brazing is aspect of the welding products and services we give.

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