Technologies
Welding is a fabrication process that joins metals by applying heat, pressure, or both to fuse materials at a molecular level. The most common types of welding used in industrial sheet metal fabricati
Welding is a fabrication process that joins metals by applying heat, pressure, or both to fuse materials at a molecular level. The most common types of welding used in industrial sheet metal fabrication are MIG, TIG, Stick (SMAW), Flux-Core (FCAW), and resistance welding — each suited to different m
Welding is a fabrication process that joins metals by applying heat, pressure, or both to fuse materials at a molecular level. The most common types of welding used in industrial sheet metal fabrication are MIG, TIG, Stick (SMAW), Flux-Core (FCAW), and resistance welding — each suited to different metals, thicknesses, and finish requirements.
The five principal welding methods differ in electrode type, shielding gas, and heat delivery. Each process delivers distinct advantages depending on material, thickness, and production volume:
MIG Welding (GMAW) — A continuously fed wire electrode melts into the joint under inert gas shielding. Fast, cost-effective, and ideal for mild steel and aluminium in structural frames and enclosures.
TIG Welding (GTAW) — A non-consumable tungsten electrode and separate filler rod create precision welds. Delivers superior surface finish and is the standard for stainless steel and thin-gauge sheet metal where aesthetic and dimensional control matter.
Stick Welding (SMAW) — A flux-coated electrode provides both filler and shielding. Best suited to heavy steel, outdoor work, and field repairs where portability is essential.
Flux-Core Arc Welding (FCAW) — A tubular wire filled with flux offers high deposition rates for thick steel sections. Common in heavy structural fabrication but produces more spatter than MIG or TIG.
Resistance Welding — Two electrodes compress and heat the joint without filler. Ideal for high-volume thin-sheet spot joining in automotive panels and enclosures.
| Welding Type | Best For | Typical Application |
|---|---|---|
| MIG (GMAW) | Mild steel, aluminium, fast production | Structural frames, enclosures |
| TIG (GTAW) | Stainless steel, thin gauge, high finish | Precision parts, food-grade equipment |
| Stick (SMAW) | Outdoor, heavy steel, field repairs | Construction, heavy fabrication |
| Flux-Core (FCAW) | Thick steel, high deposition rate | Heavy plate, structural welding |
| Resistance Welding | Sheet metal spot joining, high volume | Automotive panels, enclosures |
Material type and thickness drive the choice. For mild steel sheet metal up to 3 mm, MIG welding delivers fast production at competitive cost. Stainless steel and aluminium require TIG — it prevents oxidation and porosity. Entag executes TIG welds on 304 and 316 stainless steel to ±0.3 mm tolerance with controlled HAZ distortion. For structural steel, CNC machining services in Egypt and welding achieve ±0.5 mm post-weld tolerance when qualified to AWS D1.1 or EN ISO 15614. High-volume thin-sheet assemblies use resistance welding for speed and repeatability. Engineers in Cairo, Alexandria, Jeddah, and Riyadh specify the welding process on fabrication drawings by material grade, thickness, and finish — Entag's team reviews drawings and recommends the optimal process with a quote within 24 hours.
Industrial welding for structural and precision applications follows ISO 3834 (Quality requirements for fusion welding of metallic materials). Entag's operations align with ISO 3834 principles on MIG and TIG processes for steel, stainless, and aluminium. AWS D1.1 and EN ISO 15614 validate joint strength in load-bearing fabrication. Quality is verified through visual inspection, dimensional measurement, and ultrasonic or radiographic testing where specified. Material-specific filler wire — such as ER70S-2 for mild steel or ER308L for 304 stainless — ensures the joint matches parent material properties. Heat input is controlled to prevent HAZ distortion in thin-gauge sheet metal, and sheet metal fabrication in Egypt fixtures maintain alignment during cooling.
What is the difference between MIG and TIG welding?
MIG welding uses a continuously fed wire electrode and is faster for mild steel and aluminium production. TIG welding uses a non-consumable tungsten electrode and separate filler rod, delivering cleaner, more precise welds on stainless steel and thin-gauge sheet metal. TIG requires more operator skill and slower travel speeds but produces superior surface finish and dimensional accuracy, with typical tolerances of ±0.25 mm on 1.5 mm stainless steel sheet.
Which type of welding is the strongest?
Joint strength depends on process, material, and preparation. TIG welds on properly prepared stainless steel can achieve near-parent-metal strength with yield properties matching the base material. For structural steel, MIG and Stick welds qualified to AWS D1.1 or EN ISO 15614 are fully load-bearing when executed with proper penetration, inter-pass temperature control, and PWHT (post-weld heat treatment) where required by specification.
What type of welding is used for sheet metal fabrication?
MIG (GMAW) is most common for sheet metal due to speed and cost-efficiency on mild steel up to 6 mm. TIG (GTAW) is preferred for surface finish, precision, or thin-gauge material requiring aesthetic appearance. Resistance spot welding handles high-volume thin-sheet assemblies in automotive applications. The choice depends on material, thickness, and finish requirements — consult tube fabrication services or similar platforms for material-specific guidance.
What is flux-core welding used for?
Flux-core arc welding (FCAW) is used for welding thicker steel sections (typically 4 mm and above) where high deposition rates and deep penetration are needed. It works outdoors or in conditions where shielding gas is impractical, uses tubular wire with internal flux cored at approximately 15–25% wire diameter, and is common in heavy structural fabrication but unsuitable for thin sheet metal or applications requiring clean aesthetics.
Can stainless steel and aluminium be welded using the same process?
No. Stainless steel is welded with TIG (GTAW) using argon shielding and matching filler wire (ER308L for 304, ER316L for 316 grade). Aluminium also uses TIG or MIG with argon shielding but requires different filler alloys (ER4043 or ER5356) and higher heat input. Using the wrong process or filler causes porosity, cracking, and loss of corrosion resistance in both materials.
How do I know which welding type to specify in my fabrication drawing?
Specify material grade (S235, 304 stainless, 5052 aluminium), sheet thickness, joint type (butt, fillet, lap), and finish or standard requirements (ISO 3834, AWS D1.1). Experienced platforms review drawings and recommend the optimal process with a detailed quote within 24 hours. Explore 3D printing services in Egypt and other advanced fabrication options to complement your welding strategy.
Ready to start your project? Request a quote on Entag — upload your CAD file and get a price in 24 hours.
