- Do the population set have breating issue, eyesite issue ,face buring issue, sleeping disorder etc.- compare the data before welding and after welding
- The person for whom the issue arrised did they took any safety measuremets? - if they did individual safety measurement
- Were they smoker or non smokers who had issues after weldering?
- What type of weding were the infected persons using - Tacking/Continuous/both
- What current range were the infected persons using -?>180 A or <120 A or 120-180 A