MIG welder and assembly hand: how to train and review the role
Welds sheet-metal and frame sub-assemblies on a fixture using MIG equipment, or fits parts on an assembly line. Follows the welding procedure and the line takt, and reports to the cell leader or line supervisor.
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Share your requirementsWho usually fills this role
Common sources are ITI welder trades, helper-turned-welder on the plant floor, and experienced welders from fabrication shops. Hire on a practical test: a bead on a coupon, a fixture load and a visual check. Ask about gas, wire and polarity so you know what they understand versus copy.
Skills ladder
Stage 1
New joiner
- Loads the fixture correctly and clamps parts in the right order
- Strikes an arc and lays a clean bead on practice coupons under watch
- Uses welding helmet, gloves and fume extraction without being told
Stage 2
Independent
- Welds production joints to the weld standard and hits the spot or seam count on the work instruction
- Checks wire feed, gas flow and tip condition at the start of the shift
- Spots spatter, porosity, undercut and misfits and stops the line
Stage 3
Senior or lead
- Welds difficult joints and repairs rejected welds correctly
- Reads the welding procedure and adjusts within limits when material changes
- Trains new welders and passes weld test sign-offs
Training path
First weeks
- 1
Safety and fume control
The safety officer shows ventilation, fire watch, hot work rules and burn first aid in the welding bay. The welder explains each risk back and is signed off on a checklist.
- 2
Coupon practice
A senior welder teaches stance, torch angle and travel speed on scrap coupons. The supervisor checks bead appearance and cuts a coupon open for a penetration check.
- 3
Fixtures and the work instruction
The cell leader walks the joiner through fixture loading, spot count and sequence for one model. The joiner repeats the sequence and is checked on twenty parts.
First year
- 1
Supervised production
The welder works one fixture under the cell leader's eye. Rejected welds are shown at the end of each shift with the cause, such as gas, speed or fit-up.
- 2
Weld defect recognition
The quality inspector shows real defect samples: porosity, burn-through, cold lap. The welder sorts a tray and is tested on what is accepted and what goes to repair.
- 3
Equipment basics
A maintenance electrician teaches wire spool change, liner, nozzle and tip care. The welder demonstrates the change and logs it on the machine card.
Towards senior
- 1
Qualification for new joints
The welding engineer sets a practical test for each new joint type. The welder is signed off only after destructive or visual checks pass.
- 2
Root-cause on weld rejects
The welder joins the quality engineer to trace a recurring reject to gas, fit-up or fixture wear. A fix is trialled and written into the work instruction.
- 3
Coaching
The welder coaches newcomers on coupon practice and observes their first joints. The cell leader checks that coached welders reach sign-off cleanly.
Performance review
Daily feedback from the cell leader, a monthly review of weld rejections and check sheets, and a written half-yearly review. Re-test after a long absence or when a new model is introduced.
What to measure
| Measure | How it is seen |
|---|---|
| Weld quality at inspection | Inspector findings and rework tags by welder |
| Accuracy of weld count and sequence | Line audit against the work instruction |
| Equipment checks | Start-of-shift checklist entries, gas and wire consumption notes |
| Safe working | Observation of PPE, fume extraction and fire watch |
| Repair ability | Rework jobs the welder completes and passes on re-inspection |
| Skill spread | Joint types and models the welder is qualified to run |
Evidence to bring
- Start-of-shift equipment checklist
- Weld rejection and rework tags
- Qualification test records
- Fixture condition notes
- PPE and safety observation notes
Questions to ask in the review
- Which weld type do you find hardest?
- What do you check first when a bead looks wrong?
- Did any fixture give poor fit-up this period?
- How is the fume extraction near your station?
- What would help you reduce spatter?
- Which model or joint would you like to be qualified on?
- Did you ever feel pressured to pass a doubtful weld?
- What support do you need from the cell leader?
Pitfalls
- Rushing newcomers onto structural welds before they pass a coupon test
- Rewarding speed while the weld standard goes unchecked
- Never telling the welder why a weld was rejected
- Skipping health and ventilation checks in a hot, fumey bay
Questions about this role
Set a practical test for each joint type that matters to safety or strength. Keep the test records, and ask your quality head what your customer expects. Confirm any formal certification needs with your adviser.
Use the same structure: torque and fit accuracy, takt keeping, defect catching and safe working. Check against the line audit and the work instruction at the station.
Check equipment settings and wire quality first. Then re-demonstrate the standard with samples. Only after that treat it as a performance issue and record the conversation.