Red head tungsten needle (thoriated tungsten electrode)
Material composition: Contains 2% thorium dioxide (ThO₂)
Radioactivity: Slightly radioactive (in compliance with safety standards)
Arc characteristics: The arc is more concentrated and stable
Current carrying capacity: High (30% higher than cerium tungsten)
Gray head tungsten needle (cerium tungsten electrode)
Material composition: Contains 2% cerium dioxide (CeO₂)
Radioactivity: Non-radioactive (environmentally friendly)
Arc characteristics: Excellent arc starting performance, good low current performance Current carrying capacity: Moderate, easy to burn out with high current
1. Characteristics of red head tungsten needle (thoriated tungsten electrode)
Applicable scenarios:
Welding of high-strength materials such as carbon steel, stainless steel, silicon copper, titanium alloy, etc.;
High current operation (such as thick plate welding, automatic welding machine).
Advantages:
Strong arc penetration and deep weld penetration;
Low electrode loss rate and long service life.
Limitations:
Radiation protection should be paid attention to (storage/disposal should be regulated).
2. Characteristics of gray-headed tungsten needle (cerium-tungsten electrode) Applicable scenarios:
Welding of thin plates, precision parts (such as electronic components);
DC welding of stainless steel, copper, and bronze.
Advantages:
Low arc starting voltage, convenient operation;
No pollution, in line with environmental protection requirements.
Limitations:
Poor burning resistance under high current.
3. Purchase and use suggestions Red head priority scenarios:
Automatic welding production lines requiring high stability arc;
Metal materials with welding thickness ＞3mm. Gray head priority scenarios:
Manual welding, low current precision operations (current ＜150A);
Enclosed workshop environment sensitive to radioactivity.
General tips:
Diameter selection: 1.6mm, 2.0mm are suitable for most scenarios (e.g. 2.4mm is used for current ＞200A);
Replacement standard: Replace when the tungsten needle tip is worn and deformed or the arc diverges.
Note: Both require matching inert gas protection (such as argon) to avoid weld oxidation.
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