Which arc-start method for GTAW has the highest cost?

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Study for the CSA Welding Inspector Certification Test (W178.2) Level 1. Use flashcards and multiple choice questions with hints and explanations. Prepare for your certification!

Multiple Choice

Which arc-start method for GTAW has the highest cost?

Explanation:
Arc-start methods influence running costs through electrode wear and contamination. The contact/lift start uses a metal-to-metal touch to strike the arc, which causes more tungsten erosion and a greater chance of base-metal contamination of the electrode. This leads to more frequent electrode replacement or reconditioning and additional post-weld cleanup, plus extra maintenance for the lift/contact mechanism. Other methods avoid or minimize direct contact or contamination, and high-frequency start, while adding upfront equipment cost, tends to reduce consumable and cleanup costs over time. For these reasons, the contact/lift start typically has the highest ongoing cost.

Arc-start methods influence running costs through electrode wear and contamination. The contact/lift start uses a metal-to-metal touch to strike the arc, which causes more tungsten erosion and a greater chance of base-metal contamination of the electrode. This leads to more frequent electrode replacement or reconditioning and additional post-weld cleanup, plus extra maintenance for the lift/contact mechanism. Other methods avoid or minimize direct contact or contamination, and high-frequency start, while adding upfront equipment cost, tends to reduce consumable and cleanup costs over time. For these reasons, the contact/lift start typically has the highest ongoing cost.

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