Bench Test / WeldKing / CoolCut40air

Test intent

Separate internal-air package faults from normal torch, clamp, and external-air faults.
Verify valve behavior, compressor branch behavior, and start quality after repair.
Confirm the machine behaves correctly in both internal-air and external-air modes when required.

Check	Expected condition	Result
Torch front-end stack	correctly assembled, fresh SG55 consumables	pass / fail
Clamp placement	bright metal, tight return path	pass / fail
Internal-air package	water trap drained and internal compressor path unobstructed	pass / fail
External-air path if used	dry air and stable pressure under flow	pass / fail

Checkpoint	Expected value or behavior	Record actual
Internal-air trigger test	air should follow the intended internal path only
External-air trigger test	external path should not be held open incorrectly
Dual-air behavior	both paths should not flow together unless the fault is present
Start behavior	repeatable pilot and transfer on clean steel

Test	Pass condition	Result
Internal-mode retest	stable internal air delivery and clean start	pass / fail
External-mode retest	stable external air delivery and clean start	pass / fail
Short cut	stable cut without dropout or moisture-related sputter	pass / fail
Warm retest	no return of dual-air or valve confusion after several starts	pass / fail

Both air paths move at once only in internal mode: stay in valve control or valve contamination branch.
Complaint exists only in one air mode: keep diagnosis in that package branch first.
Backward purge through the external path restores normal behavior: stop at valve contamination before board blame.
Poor cut with moisture signs: stay in filter, water-trap, and torch front-end branch.
Start complaint in both modes with healthy air: move into power or control only after air proving is done.

Use these only after the complaint has been proven to follow the SG55 torch-front-end or air-package branch.
CoolCut40air parts category: official CoolCut40air parts path
SG55 electrode 07Y2517003: official product page
SG55 nozzle 07Y2517004: official product page
SG55 tip 07Y2517005: use the official parts category above.

Signoff item	Result
Internal-air mode restored	pass / fail
External-air mode restored if used	pass / fail
Stable start and cut restored	pass / fail
No dual-air or contamination behavior remains	pass / fail
No abnormal valve or moisture behavior after retest	pass / fail

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