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One of the most common mistakes when buying a welder is choosing a machine based only on maximum amperage. It’s easy to understand why — manufacturers highlight big amp numbers, and buyers naturally assume more power means a better machine.

One of the most common questions welders ask is simple but important: what size welder do I actually need for the material I’m working with? The mistake most buyers make is choosing based on marketing labels like “industrial” or “heavy duty” instead of understanding how material thickness affects machine requirements.