SIGMAWElD MC - Boat Design Net

00786813590SIGMAWELD MC 7177November 1999RECOMMENDEDSUBSTRATECOND/TIONSAND TEMPERATURES- steel; shot blast cleaned to ISQ-Sa2Y2 blasting profile (R); 40-70 ~ml- on steel blasted to above profile, the reGommendedft, 18 ~m,corresponds to 22 IJm as measured on a smooth test panel- minimum thickness for a closed film is 15 ~m measured on a smoothtest panel- substrate temperature may be up to max. 35°C- for automatic application a substrate temperature of 30°C isrecommended- the temperature of the substrate should be at least JoG above dew point- relative humidity during curing should be above 50%SYSTEM SPECIFICATION system sheet 3015primersSECONDARYSURFACEPREPARATION- during storage and construction, contamination of the prefabricationprimer should be limited- after fabrication, sur1ace defects should be treated according to thescheme below- where two possible sur1ace treatments are indicated, the choice oftreatmerit is dependent on the location and on the system to be applied(see system sheets)- the preferred pretreatment tor optimal results is shown; otherpossibilities are indicated in bracketsexposure conditionscontaminatlonweldseamsburned areasdamaged corroded areaswhite rust. cleaning by silicon carbide impregnatedimmersedto be removedISO-Sa2Y2(SPSS-Pt3)ISO-Sa21h(SPSS-Pt3)ISO-Sa2Y2(SPSS-Pt3)SPSS-ID Pt2(SCAP*)abrasive padatmosphericto be removedSPSS-Pt2SPSS-Ss(SPSS-Pt2)SPSS-Ss(SPSS-Pt2)SPSS-ID Pt1(SCAP -)Note that the back of welded plate may show discoloration (especially onplate where fillets have been welded on), this iS not to be confused withburned areas and do not reQuire special treatment. Burned through areasmay be present (this happens especially when welding thin steel) and theseshould then be treated as per "burned areas" above.