{"id":387,"date":"2026-05-23T12:11:22","date_gmt":"2026-05-23T12:11:22","guid":{"rendered":"https:\/\/nathanengineering.in\/blog\/?p=387"},"modified":"2026-05-23T12:25:34","modified_gmt":"2026-05-23T12:25:34","slug":"steel-components-manufacturer-india-welding-processes-guide","status":"publish","type":"post","link":"https:\/\/nathanengineering.in\/blog\/steel-components-manufacturer-india-welding-processes-guide\/","title":{"rendered":"Steel Components Manufacturer in India: The Complete Welding Processes Guide \u2014 MIG, TIG, Spot, and Beyond"},"content":{"rendered":"\t\t
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Introduction: Welding Is Where Steel Components Are Made or Broken<\/h2>\n

Of all the processes involved in manufacturing steel components, welding carries the highest consequences for getting it wrong. A machined dimension that is out of tolerance can be reworked. A laser cut profile that is slightly off can be recut. A weld that is incomplete, porous, cracked, or incorrectly sized cannot be invisible \u2014 and in a structural or pressure application, it cannot be acceptable.<\/p>\n

Nathan Engineering, as a steel components manufacturer in India with certified welding capability across multiple processes, uses this guide to explain the most important welding processes for steel components \u2014 when each is the right choice, what joint design principles apply, what quality controls are required, and what buyers should verify when evaluating a potential welding supplier.<\/p>\n

Process 1: MIG Welding (GMAW \u2014 Gas Metal Arc Welding)<\/h2>\n

What MIG welding is and how it works<\/h3>\n

MIG (Metal Inert Gas) welding, formally known as Gas Metal Arc Welding (GMAW), uses a continuously fed wire electrode that melts in an electric arc between the wire and the workpiece. The arc and weld pool are shielded from atmospheric contamination by a shielding gas \u2014 typically a mixture of argon and carbon dioxide (CO2) for mild steel, or pure argon for stainless steel and aluminium.<\/p>\n

MIG welding is a semi-automatic process in most industrial applications \u2014 the welder controls torch position, travel speed, and angle while the machine automatically feeds wire and maintains the arc. Robotic MIG welding automates all of these variables for high-volume production.<\/p>\n

When MIG welding is the right choice for steel components<\/h3>\n
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  • Structural steel fabrication \u2014 frames, chassis, machine bases, and any assembly where weld deposition rate matters more than cosmetic appearance<\/li>\n
  • Medium to heavy gauge steel \u2014 material thicknesses from 2 mm to 25 mm and above<\/li>\n
  • High-volume welded assemblies \u2014 MIG welding’s faster deposition rate and semi-automatic operation make it more productive than TIG for most structural applications<\/li>\n
  • Carbon steel and low alloy steel \u2014 MIG’s productivity advantage is most pronounced on carbon steel, where the process is well-optimised<\/li>\n<\/ul>\n

    MIG welding limitations<\/h3>\n

    MIG welding produces more spatter than TIG welding (small particles of molten metal ejected from the weld pool), requires post-weld spatter removal for appearance-critical surfaces, and produces wider heat-affected zones (HAZ) than TIG. For thin material (below 2 mm), stainless steel, and cosmetic-quality welds, TIG welding is typically preferred.<\/p>\n

    Nathan Engineering’s MIG welding capability<\/h3>\n

    Nathan Engineering’s welding team operates MIG welding for structural carbon steel assemblies \u2014 machine frames, guarding panels, welded enclosures, brackets, and equipment structures. Shielding gas mixtures are selected for the base material: Ar\/CO2 blends for carbon steel, pure argon for stainless steel MIG welding where TIG is not specified.<\/p>\n

    Process 2: TIG Welding (GTAW \u2014 Gas Tungsten Arc Welding)<\/h2>\n

    What TIG welding is and how it works<\/h3>\n

    TIG (Tungsten Inert Gas) welding uses a non-consumable tungsten electrode to create the arc, with filler metal added separately by hand as a rod. The weld pool and electrode are shielded by pure argon or argon\/helium gas. The welder controls all variables \u2014 arc length, filler addition rate, travel speed \u2014 requiring significantly more skill than MIG welding.<\/p>\n

    TIG welding produces the highest quality welds of any arc welding process: low spatter, clean appearance, narrow HAZ, and superior control over weld bead geometry. It is the preferred process for stainless steel, aluminium, titanium, and any application where weld quality is paramount.<\/p>\n

    When TIG welding is the right choice<\/h3>\n
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    • Stainless steel components \u2014 TIG welding’s low heat input minimises sensitisation of the heat-affected zone, preserving the corrosion resistance of the stainless alloy. Nathan Engineering uses ER308L filler for SS304 and ER316L filler for SS316 as standard.<\/li>\n
    • Thin material (0.5 mm to 3 mm) \u2014 TIG’s precise arc control enables welding of very thin gauges without burn-through<\/li>\n
    • Cosmetic-quality welds \u2014 TIG produces smooth, consistent bead profiles that require minimal post-weld finishing<\/li>\n
    • Pressure-containing welds \u2014 piping, pressure vessels, and hydraulic assemblies where weld quality directly affects safety<\/li>\n
    • Root pass in multi-pass welds \u2014 TIG is frequently used for the root pass on structural welds (to ensure full root penetration) with MIG or SMAW for subsequent fill and cap passes<\/li>\n<\/ul>\n

      Back-purging for stainless steel TIG welding<\/h3>\n

      When welding stainless steel tube, pipe, or closed sections, the back face of the weld (the side not directly accessible to the torch) can be oxidised and sensitised by atmospheric oxygen during welding. Back-purging \u2014 flooding the internal space with argon before and during welding \u2014 prevents this oxidation and ensures that the internal weld surface has the same corrosion resistance as the external surface.<\/p>\n

      Nathan Engineering implements back-purging for all stainless steel tube and pipe welds where the internal surface quality is specified \u2014 a practice that distinguishes technically correct stainless welding from cosmetically acceptable but metallurgically compromised welds.<\/p>\n

      Post-weld treatment for TIG-welded stainless steel<\/h3>\n

      Even correctly performed TIG welds on stainless steel produce heat tint (the blue, gold, and brown discolouration visible around the weld) caused by oxidation of the chromium oxide passive layer during welding. This heat tint reduces corrosion resistance in the affected area and must be removed by:<\/p>\n

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      • Pickling \u2014 acid treatment (nitric\/hydrofluoric acid paste or bath) that removes heat tint and restores the passive layer. Required for food, pharmaceutical, and marine-grade stainless assemblies.<\/li>\n
      • Electrochemical cleaning \u2014 a lower-hazard alternative to acid pickling that uses electrochemical action to remove heat tint. Nathan Engineering uses this method for field repairs and for assemblies where acid pickling is impractical.<\/li>\n
      • Mechanical brushing \u2014 stainless steel wire brushing (dedicated brushes that have never touched carbon steel) removes surface tint but does not fully restore the passive layer. Followed by passivation for critical applications.<\/li>\n<\/ul>\n

        Process 3: Spot Welding (Resistance Spot Welding)<\/h2>\n

        What spot welding is and how it works<\/h3>\n

        Spot welding (resistance spot welding, RSW) joins overlapping sheets of metal by passing a high-amperage, low-voltage electrical current through the joint via copper electrodes pressed against both sides of the stack. The electrical resistance of the metal generates localised heat at the interface between the sheets, melting a small nugget of metal that fuses the sheets together when the current ceases and the electrodes maintain pressure during cooling.<\/p>\n

        Spot welding is a rapid, clean, and highly repeatable process with no filler metal, no shielding gas, and minimal heat distortion. A single spot weld on 1 mm mild steel can be completed in under one second. Robotic spot welding systems produce hundreds of welds per minute in automotive body-in-white manufacturing.<\/p>\n

        When spot welding is the right choice for steel components<\/h3>\n