At Avweld, we use hardfacing to protect against abrasion, erosion, corrosion, and impact. By applying the right solution for each application, we help maximise equipment life in high-stress and harsh operating environments.

There are many types of hardfacing, each designed for specific conditions. Selecting the wrong type can reduce performance, so it’s important to get the right advice. Speak with Avweld for expert guidance tailored to your needs.

In addition to our comprehensive repair and maintenance services, Avweld also supplies a full range of hardfacing consumables, including wires, rods, electrodes, and powders. These products are available through our welding consumables division, Alloys International.

Tungsten Carbide Hardfacing is the best available material for abrasion resistance. However, it does have less impact resistance than other types of hardfacing. When applied by the PTA process, it can be applied relatively thickly in 3mm layers. Avweld apply tungsten carbide using robots for the best consistency. Tungsten carbide is also applied by the HVOF thermal spray process to apply thinner coatings.

Avweld have developed an exclusive range of tungsten carbide coating materials for use with the PTA which has unmatched abrasion resistance throughout Australia.

Chrome Carbide Hardfacing is a popular choice for ground engaging tools (GET) and in mining and mineral processing. Chrome Carbide is the hardfacing used in composite wear plates such as AbrasaPlate. It is available in sheet form with up to 20mm thick hardfacing. This can then be cut, rolled and welded to apply to wearing parts. Chrome carbide can be applied by PTA, MIG, HVOF and Arc Spray processes.

Martensitic Hardfacing (such as AI-1746) is applied primarily using the MIG welding process. It is one of the most commonly used types of hardfacing, used in general purpose applications. AI-1746 has good impact resistance, and good abrasion resistance.

Avweld’s AV10 Chrome Boron hardfacing is a work hardening high chrome (~27%) alloys made exclusively for Arc Spraying. AV10 is a great choice when no heat input to the substrate is allowed. The Arc Spraying process is a cold process, where the temperature of the substrate never goes above 100 degrees. So there is no deformation or metallurgical changes. AV10 can be applied up to 2mm thick.

Nickel alloys (such as Inconel™​) and Cobalt alloys (such as Stellite™) are most commonly used for the corrosion and high temperature resistance. However, these materials are often blended with other alloys such as tungsten and chrome to provide high abrasion resistance. Stellite™ 6 is one of the most commonly used materials used for corrosion and abrasion resistance in pumps and valves. Avweld apply these materials using all of the processes listed on this page. We are also able to supply solid castings of Nickel and Cobalt alloys.

*Stellite™ is a trademark of Kennametal Inc and Inconel™ is a trademark of Huntington Alloys Corp.

Ceramic hardfacing is applied in very thin, very hard layers. Ceramics have extremely high melting temperatures so need to be applied by the Plasma spray process. Materials such as Chrome Oxide, Aluminium Oxide, and Titanium Dioxide are used for a mixture of corrosion and abrasion resistance.

Laser cladding utilises a high powered energy source to melt an additive stock material and weld it to the substrate, providing the advantageous properties of the additive material to the surface. Because the laser energy is so concentrated, it allows for the cladding material to have a full metallurgical bond, without the disadvantages of typical welding processes by minimising heat affected zone (HAZ), dilution and distortion.

Plasma Transferred Arc (PTA) Welding is a welding process with relatively low heat input. The low dilution means that the best possible hardness is possible in a single layer of 2-3mm thick. PTA welding provides similar properties to Laser Welding for cladding applications. Avweld use robots for our PTA welding process to ensure absolute consistency.

High Velocity Oxygen Fuel (HVOF) is a thermal spray process which combusts oxygen and flammable gas to provide a very high speed flame. Avweld use the latest HVOF system from Flame Spray Technology in Europe. This process provides extremely dense coatings with virtually no porosity.

HVOF is used to spray hardfacing such as tungsten carbide and chrome carbide. It can also be used to spray nickel and cobalt alloys.

Twin wire arc spray uses an electric arc to melt two wires against each other, and then blow the molten metal onto a surface using compressed air. The process is fast, and thick build-ups are possible. Avweld regularly use twin wire arc spray to apply hardfacing to large jobs. Arc spray can also be used for dimensional restoration of worn parts.

DC-plasma spray systems are used primarily for the application of high melting temperature ceramic coatings. The system works by ionising a plasma gas using extremely high currents, to create a plasma flume at a temperature of around 30,000°C. Avweld have Australia’s most modern and most technologically advanced plasma spray system.

Spray-and-fuse is the process where a metal sprayed deposit is heated to the point of melting, and then forms a metallurgical bond with the substrate. This is frequently used with nickel based hardfacing coatings.

MIG welding is used commonly across many industries because of its ease of operation and low capital costs. Hardfacing is commonly applied using the MIG process. Material can include martensitic alloys, chrome carbide, tungsten carbide and nickel/cobalt alloys. MIG welding has a relatively high heat input, so distortion of parts can be an issue. It is also important to be aware of the metallurgy of the substrate, as some substrates can be difficult to weld.