Surface Hardening Electrodes

The electrodes of this group are used for surface hardening and repair of parts. In most industries, metal parts undergo various abrasion processes. The created abrasion changes the dimensions, slows down and reduces the efficiency of the metal part. Since the replacement of these parts requires a lot of costs, in order to reduce costs, surface hardening operations are used to repair, rebuild and increase the useful life of the parts. In this method, by creating a hard and wear-resistant layer on the surface of the part, the working life of the part is increased.

Materials that have surface hardening capabilities include plain carbon, low-alloy steels, stainless steel, cast irons, nickel-based alloys, and copper-based alloys. The materials used for surface hardening are usually ferrous base alloys which are divided into three general categories of martensitic, austenitic and carbide ferrous alloys:

  • Martensitic iron alloys achieve the desired hardness after welding and are suitable for cases where there is metal-to-metal wear.
  • Austenitic iron alloys are usually soft after welding and harden during work. These materials have a high impact resistance.
  • Carbide Iron Alloys have a high-volume fraction of hard carbide particles that are embedded in the tough and soft background. The high hardness of carbide particles along with the toughness of the substrate makes these alloys very resistant to abrasion and impact.

In cases where the working temperature of surface hardened parts is high, instead of using iron-based electrodes, chrome-based electrodes are used for hardening operations. Due to high deposition rate, availability of consumables, welding capability in remote areas, economics and great variety of electrodes, arc welding process with manual electrode is the most common method for surface operation and deposition of hard layer in large steel parts.

Applications of Surface Hardening Electrodes:

Cement, mining, steel, railways, power plants, shipbuilding, lumber and textiles, sugar and sugarcane, etc

Cons

  1. Welding wire and carbon steel and low alloy branches
  2. Do not rust welding wire and steel branches
  3. Welding wire and aluminum alloy branches
  4. Welding wire and carbon steel and low alloy branches
  5. Do not rust welding wire and steel branches
  6. Welding wire and aluminum alloy branches