Bench Test / WeldKing / CUT40

Test intent

Separate torch, external air, and clamp faults from control-valve or main-output faults.
Verify stable start and transfer after repair with the correct CB50 hardware.
Confirm the machine is not being misdiagnosed because of guide hardware, stand-off, or hose contamination.

Tools and setup

Multimeter
Dry external air source
Fresh CB50 front-end stack
Clean mild-steel coupon
Known-good work clamp

Pre-power checks

Check	Expected condition	Result
Torch front end	correctly assembled, fresh CB50 consumables	pass / fail
Clamp placement	bright metal, tight return path	pass / fail
Air path	dry air and stable pressure under flow	pass / fail
Guide hardware if used	guide carriage and tip hardware not bent or misfitted	pass / fail
Freehand baseline state	machine proven freehand before guided proving	pass / fail

Electrical checkpoints

Checkpoint	Expected value or behavior	Record actual
Air routing on trigger	stable external air flow with no abnormal backflow
Start behavior	repeatable pilot and transfer on clean steel
Short-cut behavior	no erratic dropout or sputter once started
Warm retest	no new symptom only after repeated starts

Functional proof

Test	Pass condition	Result
Cold start	normal start on clean steel	pass / fail
Transfer test	clean transition into the cutting arc	pass / fail
Short cut	stable cut quality	pass / fail
Guide-assisted retest if used	guide or stand-off hardware does not create the complaint	pass / fail

If it fails

Air-routing oddity: stay in hose, valve, and external-air branch.
Start complaint with worn guide or tip hardware: keep diagnosis external.
Transfer complaint only on dirty material: keep diagnosis in clamp and work-return path.
Stable air but no useful output: move deeper only after torch and air branch are proven healthy.
Freehand healthy but guide-assisted cutting fails: stay in guide, stand-off, or tip-hardware branch first.

Direct official parts pages

Use these only after the complaint has been proven to follow the torch, guide, or air branch.
CUT40 parts category: official CUT40 parts path
CB50 torch 07001710: use the official parts category above.
Guide carriage 07CV0037: official product page
Extended tip 07PD0063-10: official product page

Post-repair release

Signoff item	Result
Stable start restored	pass / fail
Stable transfer restored	pass / fail
Freehand baseline restored before guide proving	pass / fail
Short cut completed cleanly	pass / fail
No abnormal air-routing or guide-related behavior after retest	pass / fail

Technician: __________ Date: __________ Serial or shop tag: __________