Based on the previously discussed internal structure of the welding machine, its operational status can be assessed across three dimensions: external condition, parameter verification, and actual welding performance.
Inspection of External Appearance and Basic Status
Upon powering on, the power indicator light illuminates correctly, and the cooling fan runs smoothly without abnormal noise or the smell of burning; the casing is securely grounded, with no electric leakage or tingling sensations upon contact.
All wiring terminals and welding torch connections are free of looseness or signs of arcing/burning; cooling system water and gas lines are unobstructed and leak-free, with pressures meeting the specifications on the equipment nameplate.
Verification of Core Operating Parameters
Measure the no-load output voltage using a multimeter; for standard arc welding machines, this should remain stable within the 50–70V range without significant fluctuations.
During welding, the actual output current and voltage must match the set values and comply with the standard load voltage formula (U₂ = 14 + 0.05I₂); current fluctuations should not exceed ±10%, and there should be no uncontrolled surging or dropping of current.
After one hour of continuous operation, the temperature rise of core components should be ≤65°C, and the machine should not frequently trigger an overheat protection shutdown.
