Preventive Maintenance Procedures Flashcards

Which SAW power source component should be cleaned with dry compressed air during preventive maintenance to prevent overheating?

Answer: Internal cooling fins and transformer windings

Dust and debris accumulation on internal cooling fins and transformer windings restricts airflow and causes thermal shutdown or premature component failure.

What is the maintenance significance of checking the SAW electrode wire cast and helix during preventive maintenance?

Answer: Excessive cast or helix causes inconsistent contact tip alignment and arc wander

Excessive wire cast (curvature) or helix (corkscrew) causes the wire to exit the contact tip at inconsistent angles, producing arc wander and inconsistent bead placement.

During a SAW preventive maintenance inspection, the work lead clamp shows pitting and arc burns on its contact surface. What is the correct action?

Answer: Replace the clamp, as poor work lead contact causes arc instability and grounding issues

Arc burns and pitting on a work lead clamp indicate poor electrical contact that increases resistance, causes voltage fluctuations, and creates safety hazards.

What maintenance check should be performed on the SAW flux hopper valve (gate) to ensure consistent flux flow?

Answer: Verify the valve opens and closes fully without sticking, and check for flux bridging above the valve

A sticky or partially blocked hopper valve causes inconsistent flux depth over the arc, leading to porosity and incomplete slag coverage.

What SAW maintenance procedure addresses the problem of flux becoming compacted in the hopper over time?

Answer: Periodically agitate or stir the hopper contents and remove any caked flux

Compacted or caked flux in the hopper restricts gravity feed to the arc; periodic agitation breaks up compaction and removes caked material to restore consistent flow.

When inspecting SAW travel carriage guide rails during preventive maintenance, what condition requires corrective action before welding resumes?

Answer: Debris, weld spatter, or deformation that would cause carriage speed variation

Debris, weld spatter, or rail deformation causes the carriage to travel at inconsistent speeds, producing variable bead width and penetration along the weld length.

What is the purpose of megohm-testing the SAW torch lead insulation during scheduled preventive maintenance?

Answer: To detect insulation breakdown that is not visible externally but poses shock hazard

Megohm testing detects internal insulation degradation that cannot be seen visually, identifying shock hazards before they cause injury or equipment damage.