- Known input
- Provide joint type, base metal and thickness, expected welding time versus pause time, wire type and diameter, shielding gas, input voltage/frequency/phase, quantity and destination. Throughput should be stated as acceptable joints per shift under those conditions, not peak amperage alone. A public Millermatic 252 data sheet pairs rated current and voltage with duty cycle; that pairing is a comparison method, not a promise that this desk will supply that model.
- Supplier confirmation
- Ask the factory to state rated output (A/V) at a named duty cycle (%), the wire-feed range in m/min, the gun and feeder that ship with the unit, and whether an “automatic” request includes motion, fixtures and control integration or only the power source.
Choose a quotation route
Defined specification
Send rated output (A/V) screening values, the duty cycle (%) that matches the welding interval, wire type and diameter, and whether the gun, wire-feed (m/min) package and shielding-gas hardware must sit on the same line. A peak-amp leaflet without those conditions is not a complete RFQ. See how duty cycle belongs in the comparison.
Send requirementsSelection still open
If several process envelopes remain open—steel-only versus aluminum feeding, cart portable versus a fixed pad, or a power source versus an automatic station—use the sourcing steps to list those forks before ranking totals. Open selection is a written option set, not an invitation to mix robotic cells into a single-machine quote.
Review sourcing stepsProduct changeover questions
A MIG package that ran mild-steel short-circuit work will not automatically feed aluminum or a different diameter without a listed drive-roll, liner and gun change. Changeover time is a procurement input because it decides whether spare feeders, extra guns and a consumable kit belong on the machine line or as spare parts.
What changes between products?
Record the joint family, base metal, thickness range and shielding gas for each SKU. Wire material, diameter and spool arrangement decide liner and drive-roll geometry. A published wire-feed range in m/min is a feeder envelope, not proof that every listed diameter is already installed.
What must be cleaned or replaced?
Ask the factory to name which gun, liner, contact tips, drive rolls and gas hardware are included versus quoted later. Residual steel dust in a liner that will later run aluminum is a known feeding failure; treat that swap as a listed kit, not an operator afterthought. See why the consumable package belongs with the welder.
How is the first good output verified?
First-good output is a weld on the buyer’s representative joint at the named welding interval, not an empty-wire demonstration. Write the inspection: bead profile, lack-of-fusion check and whether the duty cycle (%) still holds after pauses that exist on the real shift. FAT and SAT language should use the same blanks.
Unknowns that stop a MIG quotation from being comparable
Questions buyers ask before a MIG trial is quoted
Which procurement scope is covered by a mig welding machine RFQ?
- Representative sample
Production-intent joints in the named material and thickness, including the longest weld interval that will occur in a shift—not a short coupon that never reaches thermal soak.
- Demonstration
A recorded weld using the quoted gun, wire-feed package and shielding gas, with the same input V/Hz/phase the pad will provide. Empty-wire feeding does not prove arc duty.
- Acceptance record
Duty cycle (%) against the welding interval, plus the inspection the owner will use at FAT and SAT. Spare parts for tips, liners and drive rolls should be listed if they are required to keep that interval.
Which responsibilities remain with the equipment supplier and the buyer?
Factories confirm feasibility, included hardware and exclusions in writing. Buyers keep drawings, destination, utilities, acceptance language and the purchase contract. This desk aligns replies; it does not sign FAT or SAT, invent a saving percentage, or certify any plant.