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D 107 Cleaning of resistance welding robots with CO2 pellets ( Date: 2004-06-11 )
Robots for resistance welding of car body parts (plus the corresponding jigs and transport facilities) are cleaned from slag and spatters by mobile blast machines and CO2 dry ice pellets; thereafter normal welding operation of robots
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Type of cleaning : Dry CO2 ice blasting
Cleaning support : Lifting contaminants by sublimation of the CO2 ice
Description : 15 blasting machines clean 1300 robots in 7 hrs. once in a week
Since when do you apply current cleaningsystem? : 1 / 1995
Step : 1. Blasting, 30 litre, 20,0 ░C, (Dry ice, CO2)
Duration of cleaning process for one part (min.) : 5,0
Duration of cleaning process for the charge (min.) : No statement
How often is the cleaning done (per day) : 0,1
Further treatment : Continued operation/application
Surface requirements : thin film of oil/grease tolerable/desired
Free of metallisations
Description: Robots should weld again without problems
Quick tests Visual control
Advanced tests : No statement
Quality of cleaning : very good
Company evaluation of cleaning process in general : very good
Comment : Great savings as compared to earlier manual cleaning with hammer and chisel
Incidences : No statement from company
Working environment : No statement from company
Protection equipment : Local exhaustion
Helmet with a shield

Evaluation by company personnel
Occupational safety and health : satisfactory
Environment protection : very good
Cleaning time : very good
Waste management : good
Cleaning quality : very good