Welder Red Seal · Question
A welder is experiencing intermittent arc wandering and poor wetting when GTAW welding 5052 aluminum tubing with AC current. After inspecting the tungsten, they find a rough, black deposit on the tip. What is the most appropriate immediate action to rectify this problem?
A rough, black deposit on the tungsten tip indicates contamination, often from the base metal or filler wire. This contamination directly leads to erratic arc b
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Question: A welder is experiencing intermittent arc wandering and poor wetting when GTAW welding 5052 aluminum tubing with AC current. After inspecting the tungsten, they find a rough, black deposit on the tip. What is the most appropriate immediate action to rectify this problem?
Answer options:
- Increase the AC frequency to stabilize the arc.
- Switch to a smaller diameter tungsten electrode. ✅ Grind the tungsten clean and thoroughly clean the aluminum base metal.
- Increase the shielding gas flow rate to purge more effectively.
Correct answer: Grind the tungsten clean and thoroughly clean the aluminum base metal.
Explanation: A rough, black deposit on the tungsten tip indicates contamination, often from the base metal or filler wire. This contamination directly leads to erratic arc behaviour and poor wetting. Grinding the tungsten clean and ensuring the base metal is free of oxides and impurities are crucial steps to restore proper welding conditions.
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