STG12 12V Cordless Tungsten Grinder User Guide

Strata STG12 12V Cordless Tungsten Grinder – Precision TIG Electrode Sharpener 

If you are still sharpening TIG tungsten electrodes on an angle grinder or bench grinder, you are compromising arc stability, penetration control and weld appearance. 
The Strata STG12 12V Cordless Tungsten Grinder is purpose-built for TIG welders who require accurate, centred and repeatable tungsten geometry. Whether working in a fabrication workshop, on-site installation or confined spaces, this compact cordless grinder keeps your electrode preparation consistent and professional. 

Designed Specifically for TIG Welding 
Unlike freehand grinding, the STG12 uses a precision guide system to produce centred electrode points at selectable angles. 
Compatible tungsten sizes: 

• 1.0 mm 
• 1.6 mm 
• 2.0 mm 
• 2.4 mm 
• 3.2 mm 
  
  

Selectable grinding angles: 

• 10° 
• 15° 
• 20° 
• 22.5° 
• 25° 
  
  

This provides up to 25 size and angle combinations, allowing you to match electrode geometry to material type, amperage and welding position for optimal arc performance. 

12V Lithium-Ion Cordless Convenience 
Powered by a built-in 12V lithium-ion battery, the STG12 delivers cordless portability without sacrificing performance. 
Key advantages: 

• Sharpen tungstens at the job, not at the bench 
• Ideal for mobile welders and site work 
• USB Type-C charging for flexible power options 
• Compact and lightweight for confined areas 

This makes it especially useful for under-vehicle welding, inside machinery, pipework, or roll cages where moving to a bench grinder is impractical. 

Variable Speed Control for Clean, Controlled Grinding 
The STG12 features six speed settings up to 30,000 RPM, allowing you to adjust grinding speed based on tungsten condition. 
Benefits of variable speed control: 

• Improved finish quality 
• Reduced overheating 
• Extended diamond wheel life 
• Better control when shaping fine points 

Heavy-duty double-sided diamond grinding discs are designed for long service life, rated for approximately 200 sharpenings per side, making the grinder cost-effective for regular TIG use. 

Built-In Tungsten Cutter for Contaminated Electrodes 
The integrated tungsten breaker allows quick removal of balled or contaminated electrode tips without leaving the work area. 
This reduces: 

• Downtime 
• Electrode waste 
• Arc instability caused by contamination 

A clean tungsten means improved arc starts and more consistent weld quality. 

Improve Arc Control and Weld Quality 
A properly sharpened tungsten electrode directly improves: 

• Arc control 
• Arc stability 
• Reduced porosity 
• Minimized arc wander 
• Cleaner weld appearance 
• More consistent penetration 

For aluminium, stainless steel and carbon steel TIG welding, accurate tungsten preparation is essential for professional results. 

What’s Included
Each Strata STG12 kit includes: 

• Strata STG12 12V Cordless Tungsten Grinder 
• 5 × Diamond Grinding Discs 
• 3 × Mandrels 
• Tungsten Grinder Head Assembly 
• Collet Wrench 
• USB Type-C Cable 
• Storage Bag