Use this four-part worksheet to compare process, input power, rated output and consumable path. It is a selection aid, not a substitute for the machine manual, a qualified welding procedure or hands-on testing.
Record facts in the order below. A feature matters only if it answers one of these constraints. For example, a high maximum amperage does not compensate for an undersized circuit, and a long duty cycle at one output cannot be assumed at another output.
Separate thin sheet, general plate and heavier sections. Include aluminum or stainless explicitly.
Compare MIG, TIG, stick and flux-cored routes with shielding and operator skill in view.
Read the duty-cycle table at the anticipated amperage and ambient condition.
Confirm wire or electrode classification, polarity, gas, rolls, liner and contact tip.
Background: short seams on mild-steel panels with high distortion sensitivity. Method: prioritize low-end control, tight fit-up, short weld sequencing and representative coupons. Decision: compare suitable wire-feed setups by minimum controllable output rather than headline maximum amperage.
Limits: technique and joint fit-up can outweigh machine features; burn-through remains possible.
Background: access is limited and wind makes external shielding unreliable. Method: compare stick and self-shielded flux-cored paths, then verify material, electrode classification, polarity, generator compatibility and cable length. Decision: portability is scored alongside procedure and site safety.
Limits: repair acceptance may require inspection or engineering review.
Background: mild-steel joints repeat throughout a shift. Method: estimate arc-on time, compare duty cycle at working amperage, document wire diameter, gas and drive-roll setup, then test on scrap. Decision: consistency and serviceability are evaluated with output.
Limits: a stated rating does not predict operator utilization or fixture quality.
| Evidence to collect | Where to verify | What it prevents |
|---|---|---|
| Input voltage and current | Nameplate and installation manual | Unsupported circuit assumptions |
| Rated output and duty cycle | Model specification table | Comparing maximum output alone |
| Polarity and consumable | Door chart and consumable data | Unstable feeding or incorrect setup |
| Test result on representative coupon | Documented shop trial | Learning on a finished component |
Send the four constraint groups and the model classes you are considering. The response can identify the specification tables and setup questions that deserve attention.