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Strengthening Metal Parts with Hardfacing

27 April, 18 2:42 pm · Leave a comment · reddarc
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Metallic parts sometimes fail their intended use at a lower stress than they are designated for.
Various forms of wear such as abrasion, impact, metal to metal contact, heat, and corrosion can compromise the strength of metal pieces. This is where hardfacing comes in. Hardfacing is a technique which can be applied to minimize the damage from these types of wear, helping to prolong the life of metal pieces.

What is hardfacing?

Hardfacing —often called hardsurfacing— is the covering of the metallic part with a wear resistant metal by welding. Alloys which commonly need to be hardfaced include carbon alloy and low alloy steels whose carbon content is lower than 1 %. These include stainless steels, manganese steels, cast iron as well as nickel and copper-based alloys.

Metallic parts sometimes fail their intended use at a lower stress than they are designated for.

Techniques, Materials and Costs

The particular hardfacing technique for a job depends on the geometry of the part and relative cost of the hardfacing method. Costs can vary with the deposition rate of the material.

These cost variations can be summarized as follows:

  • Flux cored arc welding (FCAW) 8 to 25 lb/hr
  • Shielded Metal Arc Welding (SMAW) 3 to 5 lb/hr
  • Gas Metal Arc Welding (GMAW), including both gas-shielded and open arc welding 5 to 12 lb/hr
  • Oxyfuel Welding (OFW) 5 to 10 lb/hr

 

Applied materials commonly include cobalt based alloys such as STELITE, and nickel based materials like chromium carbide alloys. More advanced materials such as complex carbides containing columbium, molybdenum, tungsten, or vanadium can also be used and provide more overall abrasion resistance. They also have a very low friction factor, which can be used in situations involving severe abrasion.

Hardfacing can be applied to both newly manufactured pieces, in order to prevent deterioration, or to strengthen and extend the life of worn pieces currently in use.

Red-D-Arc provides welding machines suitable for hardfacing using techniques including SMAW, FCAW and GMAW.

Orbital Welding in Opelika: Demo of Orbitalum’s powerful pipe welder

12 August, 16 9:16 am · Leave a comment · Geoff Campbell
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“We were grateful to be able to see a product demonstration for the Red-D-Arc (Orbitalum) system. The machine lived up to its expectations and the technical team was invaluable”

—Rob B. (customer)

Update: Red-D-Arc now offers Orbital Welding Equipment from Axxair. 

One of our clients, a machine shop based out of Opelika Alabama, needed a solution for welding stainless steel tubes and elbow sections efficiently that would be able to withstand hydrostatic testing of up to 300psi. After taking the time learn about their requirements, specialists from the Red-D-Arc branch in Austell Georgia, worked alongside experts from Airgas to demonstrate how the Orbitalum enclosed orbital welding system would help solve their challenges.

Red-D-Arc welding specialist Gregory Bellamy showed how the extremely narrow design of the Orbiweld 76S enclosed weld head was ideally suited for working in situations where space is limited. The Orbimat 76s was fitted with clamping shells (which are available for all dimensions of pipe) to ensure an exact match and strong hold. The pipe on this application was stainless steel tubing 1.500″ with a .035″ wall, diameter tubing (straight tube) and stainless steel elbow 180 degree 1.500″dia. with a .049″ wall. When the welds were complete, the welded pipes passed the hydrostatic testing at upwards of 300psi.

Thanks to Gregory Bellamy and Rob Storch from Red-D-Arc as well as Wayne Blamire and Bill Hatter from Airgas for their support on another successful orbital pipe welding customer demo.

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Airgas, an Air Liquide company, is the nation's leading single-source supplier of gases, welding and safety products. Known locally nationwide, our distribution network serves more than one million customers of all sizes with a broad offering of top-quality products and unmatched expertise.