Decision criteria for choosing TIG, MIG/MAG or electrode (MMA)
Anyone looking to buy a welding machine is often faced with the question: Which welding process is right for me?
Whether TIG welding (TIG), MIG/MAG welding (metal inert/active gas) or electrode welding (MMA) – each process has its strengths and limitations. The decision depends on several factors: material properties, seam requirements, accessibility, but also economic considerations such as budget and project scope.
Below you will find an overview of the most important criteria to help you select the appropriate process.
1. Material aspects
Type of material
- TIG welding (TIG): Particularly suitable for stainless steel (CrNi), aluminium and other non-ferrous metals (the machine must be able to weld with alternating current (AC)); produces very clean weld seams.
- MIG/MAG welding: Universally applicable for steel (standard), stainless steel and aluminium (conversion of the wire feed in the hose package necessary); fast and flexible.
- Electrode/MMA: Very robust and also suitable for structural steel, thicker workpieces and especially good for welding outdoors.
Material thickness
- Thin sheets (< 3 mm): TIG or MIG/MAG have the advantage here as heat input can be well controlled.
- Medium thickness (3–10 mm): MIG/MAG offers speed and efficiency.
- Thick cross-sections (> 10 mm): Electrode or MIG/MAG are better suited as they allow deeper penetration.
Accessibility of the welding point
- TIG: Requires good accessibility and steady hand control; less practical in tight spaces.
- MIG/MAG: Flexible to use with the torch/hose package, even with more complex geometries.
- Electrode/MMA: Most flexible, as only holder and stick electrode are needed – ideal for hard-to-reach areas.
Surface condition
- TIG & MIG/MAG: Require clean, metallic bright surfaces to avoid pores and inclusions.
- Electrode/MMA: Much more tolerant of rust, scale or dirt (although generally the best possible seam preparation should always be carried out) – optimal for repair work and outdoor applications.
2. Requirements for seam quality
- TIG: Very high seam quality, fine and visually clean weld seams, excellent for visible seams.
- MIG/MAG: Good to very good quality, with decent productivity; less refined in appearance than TIG.
- Electrode/MMA: Solid strength, but visually coarser; rework often necessary.
3. Economic factors
Project scope & quantities
- Single pieces / repairs: Electrode welding scores due to easy handling and cheaper machines compared to other processes.
- Mass production / many seams: MIG/MAG is the most productive solution as the process is fast and continuously deposits material.
- Finer single pieces or small series with high quality demands: TIG is worthwhile, even if slower.
Available time
- TIG: Precise but time-consuming.
- MIG/MAG: Very fast, therefore particularly efficient.
- Electrode: Medium speed, but additional work steps required due to slag removal.
Budget
- TIG systems: Usually somewhat more expensive, additional shielding gas and accessories required.
- MIG/MAG systems: Also gas-based, mid-price range, ongoing costs for gas and wire.
- Electrode inverters (MMA): Cheapest to purchase, no gas supply needed – ideal for beginners or occasional work.
Existing equipment
- If gas cylinders are already available: MIG/MAG or TIG can be used.
- If no gas supply is possible: Electrode is the simplest solution.
Practical examples for typical applications
TIG welding (TIG)
- Example 1: A stainless steel railing in a residential area is to be welded with fine, clean seams that will remain visible later.
- Example 2: Thin-walled aluminium pipes for model making or vehicle construction are processed.
- Example 3: Repair of a stainless steel exhaust system where optical quality and clean transitions are crucial.
Conclusion: Ideal when highest seam quality and appearance are required – more for precise work than for mass production.
MIG/MAG welding (metal inert/active gas)
- Example 1: Several metal shelves and steel frames are to be manufactured quickly in the workshop.
- Example 2: Bodywork on a car: Thin sheets must be joined quickly, stably and with little spatter.
- Example 3: Manufacture of garden gates or metal fences where stability and productivity matter.
Conclusion: Universal, fast and efficient – very popular for DIY enthusiasts and professionals with regular welding needs.
Electrode welding (MMA / stick electrode)
- Example 1: A steel beam is to be welded outdoors on a construction site without a gas bottle and sensitive additional equipment.
- Example 2: Repair of agricultural equipment or a trailer with thick-walled structural steel.
- Example 3: Mobile repair work in wind and weather where the welding point cannot be perfectly cleaned.
Conclusion: Robust, mobile and uncomplicated – the right choice for repairs, outdoor use and beginners with a small budget.
You have identified the right welding process for your projects and are now looking for a welding machine that meets your requirements?
With RED by Lorch everyone finds the right solution. RED offers TIG welding machines, MMA welding machines and MIG-MAG welding machines. Feel free to also read our article: "Why you need a RED welding machine"
Looking for a RED retailer?
You can easily find the right specialist dealer via our RED dealer search. More information is also available in the article “Find a retailer".
Note:
If you have questions about purchasing or need assistance with selection, please feel free to contact us via the contact form.