Spatter sticks to MIG and CO2 torch nozzles and contact tips when there is no anti-spatter film on them, and the build-up then blocks gas flow. The fix is an anti-spatter spray on a clean nozzle. For parts that will be painted or powder coated, use Micron 2110 Non Silicon Anti Spatter, which its page states is paint compatible. For general manual welding with no painting afterwards, Micron 2100 Silicon Anti Spatter is the silicone option.
Why it happens
Welding throws droplets of molten metal, and they weld themselves to any hot, bare steel or copper nearby. Spatter on the nozzle usually comes from:
- No anti-spatter on the nozzle. Without a release film, spatter bonds directly to the metal.
- High spatter from parameters, wire or gas. Voltage, wire feed, stick-out, wire condition and shielding gas all change how much spatter you get.
- A worn or dirty nozzle. Old build-up gives new spatter something to stick to.
You will see spatter balls welded to the nozzle and tip, gas flow blocked (which shows up as porosity in the weld), and nozzles being replaced more often.
How to fix it
Choose by what happens to the part after welding and how you weld:
- Parts will be painted or powder coated after welding: Micron 2110 Non Silicon Anti Spatter. Its page lists "Paint Compatible" and says it protects the workpiece from weld splashes without impairing the welding seam.
- No later painting, general manual welding: Micron 2100 Silicon Anti Spatter, for nozzles, contact tips, MIG and TIG tips and workpieces.
- Robotic or continuous welding that needs a long-lasting dry film: Micron 2121 Ceramic Boron Nitride Powder Anti Spatter. Its page says the coating does not evaporate or run, lists welding robots, and states up to 1200°C.
- High-volume line wanting a bulk water-based liquid: Micron 2118 Water based Anti Spatter, 5 L, which its page says can be applied by spray, brush or dip and suits robotic or semi-automatic welding.
The 2100 and 2110 pages do not give step-by-step directions. Follow the instructions on the can and the TDS. In practice: clean existing spatter off the nozzle first, then spray the nozzle and tip with the torch cool and the machine stopped.
What to avoid
- For parts that will be painted or powder coated, choose 2110 or 2118, whose pages state paint compatibility and silicone-free.
- Spray nozzles and tips when they are cool and away from the arc. Follow the can label; these are pressurised aerosols.
- Do not spray inside the torch body or onto the wire feed.
- Do not use anti-spatter to cover up bad parameters. If spatter is heavy, fix the settings first.
When to ask an expert
Ask a welding engineer if:
- spatter levels are very high even with anti-spatter;
- porosity continues after the nozzle is clean;
- spatter changed suddenly with a new wire, gas or machine.
These usually point to welding parameters, wire or shielding gas, not the anti-spatter.
FAQ
What is the difference between silicone and non-silicone anti-spatter?
Both stop spatter sticking. The non-silicone 2110 page lists "Paint Compatible", so it suits parts that go to paint or powder coat. The silicone 2100 is for general welding where parts are not painted afterwards.
Can I spray anti-spatter on the workpiece as well?
Yes. Both the 2100 and 2110 pages say they protect workpiece surfaces from weld splashes and list weldments among their applications.
How often should I reapply anti-spatter on the nozzle?
It depends on your duty cycle. Reapply when spatter starts to stick again. For continuous or robotic welding, a dry film such as 2121 is designed to last longer.
Why do I get porosity when the nozzle is dirty?
Spatter build-up inside the nozzle disturbs the shielding gas flow, which lets air reach the weld pool. Keeping the nozzle clean helps keep gas coverage even.
See the products: Micron 2110 Non Silicon Anti Spatter and Micron 2100 Silicon Anti Spatter. Related: 2121 Ceramic Anti Spatter, 2118 Water based Anti Spatter. More welding fixes: welding hub.