Most Common Causes
- Poor shielding gas coverage or gas flow disruption
- Dirty base metal, wire, tungsten, or consumables
- Damaged nozzle, diffuser, cup, o-ring, or gas path component
- Wrong process setup for material, gas, or wire type
Symptom-first troubleshooting
Porosity Troubleshooting
Find common welding porosity causes, shielding gas checks, nozzle and diffuser checks, setup issues, and related support pages.
Beginner Explanation
What this means in plain English
Porosity is small holes or bubbles in the weld. It usually means gas, contamination, or setup is letting air or dirt into the weld puddle.
Compatible Processes to Check
MIGTIGStickPlasma
Commonly Failed Consumables
Related Symptoms
Related Blog Guides
Machine and Equipment Pages to Check
XR-Pistol-Pro Push-Pull Gun
Machine · Miller · MIG
Miller · MIG · Multimatic 255 · Miller XR-Pistol-Pro Push-Pull Guns · 050116, 144862
XR-Aluma-Pro Push-Pull Gun Machine · Miller · MIGMiller · MIG · Multimatic 255 · Miller XR-Aluma-Pro Push-Pull Guns · 198855, 206186
Spoolmate 100 Machine · Miller · MIGMiller · MIG · Millermatic 142, Millermatic 211 PRO · Miller Spoolmate 100 Spool Gun · 186405, 186406
Spoolmate 150 Machine · Miller · MIGMiller · MIG · Millermatic 142, Millermatic 211 PRO · Miller Spoolmate 150 Spool Gun · 050622, 199387
Spoolmatic Spool Gun Machine · Miller · MIGMiller · MIG · Millermatic 252, Millermatic 255 · Miller Spoolmatic Spool Guns · 000442, 000443
Miller MDX-250 Parts Lookup Machine · Miller · MIGMiller · MIG · Millermatic 252, Millermatic 255 · Miller M-25 MIG Gun, Miller MDX-250 EZ Select MIG Gun · 1880275, 1880276
Miller MDX-100 Controlled Parts Breakdown Machine · Miller · MIGMiller · MIG · Millermatic 142, Millermatic 211 PRO · Miller AccuLock MDX-100 Gun Breakdown, MDX-100 · 1880272, 1880273
Miller MIGmatic M-100 / M-150 MIG Guns Machine · Miller · MIGMiller · MIG · Multimatic 215 PRO, Multimatic 220 AC/DC · M-100 / M-150, Miller MIGmatic M-100 / M-150 MIG Guns · 000067, 000068
Related Support Pages
Miller MDX-250 EZ Select Parts Lookup
Gun / Torch · Miller · MIG
Miller · MIG · Miller MDX-250 EZ Select MIG Gun · D-MA250, D-MA250M
Miller XR-Pistol Plus Push-Pull Guns Parts Breakdown Gun / Torch · Miller · MIGMiller · MIG · Miller XR-Pistol Plus Push-Pull Guns · 050116, 144862
Miller XR-Pistol Push-Pull Guns Parts Breakdown Gun / Torch · Miller · MIGMiller · MIG · Miller XR-Pistol Push-Pull Guns · 050116, 144862
XR-Pistol-Pro Push-Pull Gun Machine · Miller · MIGMiller · MIG · Multimatic 255 · Miller XR-Pistol-Pro Push-Pull Guns · 050116, 144862
Miller XR-Aluma-Pro Plus Push-Pull Guns Parts Breakdown Gun / Torch · Miller · MIGMiller · MIG · Miller XR-Aluma-Pro Plus Push-Pull Guns · 229887, 229891
XR-Aluma-Pro Push-Pull Gun Machine · Miller · MIGMiller · MIG · Multimatic 255 · Miller XR-Aluma-Pro Push-Pull Guns · 198855, 206186
Spoolmate 100 Machine · Miller · MIGMiller · MIG · Millermatic 142, Millermatic 211 PRO · Miller Spoolmate 100 Spool Gun · 186405, 186406
Spoolmate 150 Machine · Miller · MIGMiller · MIG · Millermatic 142, Millermatic 211 PRO · Miller Spoolmate 150 Spool Gun · 050622, 199387
Master Weld Tweco #2 Gun Parts Parts Breakdown · Tweco · MIGTweco · MIG · 000067, 000068
Miller M-80 Gun Breakdown Parts Breakdown · Miller · MIGMiller · MIG · 000067, 000068
Long-Tail Search Phrases Covered
why does my weld have pinholesMIG porosity causesTIG porosity troubleshootingshielding gas porosity checks