Tabular Hardfacing Electrodes

A welding engineer involved in repair/reclamation welding, are well aware of low heat input welding consumables and conventionally extruded welding electrodes. These electrodes have found vast "acceptance" by welding engineers in Indian industries. However, low heat input welding consumables, as the name suggests, is a misnomer, when used in relation to conventionally extruded elctrodes. Low heat input is a concept where it is "the technique" which is more important in order to achieve less heat input in the welding components.

» The Technique is:

Using Bare minimum volatge and current.
2.maintaining minimum are gap i.e. the distance between the elctrode tip and the workpiece. 3. Depositing thin layers of stringer welding beads, etc.
These few tips are very important while usingconventionally extruded low heat input electrodes to achieve low heat input which depends mostly on welder skill.

ULTRALLOY Tubular Electrode, a concept well accepted worldwide for hardfacing, "offer hiogh output with least input". These tubular hardfacing electrodes are real low heat input welding products.

» The sailent features of Ultralloy tubular hardfacing electrodes are: -

1. Functions on low operating current, hence low heat input and low dilution.
2. Because of less heat input, the distortion of the component is negligible and therefore no 'burnthrough'.
3. Densely compacted alloy metal constituents within thin steel sheath ensure high deposition rate. The thin layer of slag doesnot call for deslagging betwwen welding runs. (This is unattainable with conventionally extruded electrodes). Hence fast and efficient deposition of hard metal can be achieved.
4. Unlike conventional extruded electrodes, no baking and no special storage is required for ULTRALLOY electrodes.
5. Specially designed electrode stub-end enables easy holding of 6.3, 8 and 10mm dia. electrodes in any electrode holder. the speciaaly designed stub-end also enables ease of use of electrode with pratically no wastage. Like Chromium Carbide clad composite wearplates, the ULTRALLOY tubular electrodes, when manual metal arc welding process is employed, offer excellent wear resistance.

Tabular Hardfacing electrodes have more Techno-Economic benefits than Solid-core Hardfacing electrodes because of:
1. Lower Operating Current.
2. Higher weld metal recovery.
3. Higher deposition rate.
4. Practically no-slag.
5. Non-hygroscopic coating-longer shelf life, no pre-drying.
6. Longer component Life.

Surface Relief checks are normal and in fact desirable on weld deposits having High Carbon - High Chromium, Molybdenum, Niobium, Tungsten, Boron, Vanadium etc. These relief checks occur normally perpendicular to the direction of welding and do not propagate into the base metal.

» Deposition Rate

» Weld Metal Recovery

Durapaste is a highly abrasion resistant alloy of Chronium-Moly-Carbon-Boron designed, developed and manufactured indigenously by Duraweld, Durapaste offers strengthened, improved martensitic micro structure which helps improve matrix toughness and prevents the tearing-out of carbides by hard/sharp particles.
• It can be used effectively in the applications involving temperatures upto 350 degree C.
• Maximum hard layer deposit of 1.5mm can be obtained with Durapaste.
• Durapaste has martensitic (needle like) microstructure, therefore hard abrasive flying dust doesnot penetrate the hard deposit.
• Matrix Hardness 750-825 HVN
• One kilogram of durapaste can cover an area of 0.25 to 0.3M.
• Durapaste can be applied on any ferrous material surface where carbon equivalent is less than 0.3%.