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33 ONIA??H ;MM?H 7RHSDVVLQJVJHELHG lassen van dunne plaat en pijp laswerkzaamheden buiten laswerkzaamheden op plaatsen waar geen elektriciteit is Hiermee bedoelen we dat we meerdere processen zoals snijden en solderen met dezelfde installatie kunnen uitvoeren. Solderen kan zelfs nog met dezelfde branderset. De opname van zuurstof en stikstof uit de omgevingslucht. 4 acetyleen 3600 C propaan 2850 C aardgas 2550 C a acetyleen De hoogste vlamtemperatuur zal het snelst warmte overdragen. 'H ODVYODP b een extra aan acetyleen wordt toegevoerd De zuurstof zorgt voor de aanvoer van acetyleen. De hoeveelheid zuurstof is de juiste en zal naar verhouding te veel acetyleen meenemen. In deze fase zal alle zuurstof verbruikt zijn voor verbranding en kan dus niet meer het smeltbad oxideren. 1 De vlamtemperatuur is hier het hoogst. 2 De omgeving is hier reducerend, zodat er geen kans op oxidatie van het smeltbad aanwezig is. b Alle zuurstof voor de verbranding is dan opgebruikt, en er vindt geen reactie met het smeltbad plaats.

34 %$6,69$$5',*+('(1 3/$$7:(5. NHQPHUNHQ a Bij deze instelling verhogen we de acetyleendruk. *2* b Deze instelling gebruiken we bij het hardsolderen. **2 c Bij deze instelling wordt de zuurstof uit de omgeving verbruikt. 2** d Bij deze instelling verhogen we de zuurstofdruk. **2 e Deze instelling gebruiken we om gereedschapsstaal te solderen. *2* f Deze instelling noemen we ook wel reducerend. *2* g Bij deze instelling is gietijzer te lassen. *2* h Bij deze vlaminstelling is de vlamtemperatuur het hoogst **2 +HW ODVVHQ b als vloeibaar toevoegmateriaal stolt op koud moedermateriaal b Er vindt een slechte doorlassing plaats. Aan de onderkant is ook een goede doorlassing als een samenvloeiing van toevoegmateriaal en basismateriaal heeft plaatsgevonden. slechte doorlassing is eigenlijk een beginnende scheur b Je ziet geen oorspronkelijke plaatranden. De lasstaaf meer links in het smeltbad laten opsmelten. Bij de randinkarteling is te veel warmtetoevoer. b staaldraad met een dun laagje koper a 0,14%

35 $872*((1/$66(1 'H ODVEUDQGHU dunne pijl O dikkere pijl C H C H 2 2 O 2 Door de hoge snelheid van de zuurstof ontstaat bij een onderdruk die de C H aanzuigt. Zuurstof en acetyleen gaan gemengd verder in een verhouding die bepaald wordt door de boring in de injector. a het voorstuk d tussen 0,1 10 Pa en 0,3 10 Pa c deze te kunnen buigen om moeilijke lasplaatsen te bereiken De lassnelheid die we kunnen bereiken volgens tabel 12.1 bedraagt ongeveer 100 mm/min. 'H DXWRJHQH ODVLQVWDOODWLH 1 de bevestigingsbeugel 2 de vlamdover De brander in ieder geval niet ontsteken. De instelling van de acethyleendruk controleren. De aansluiting van het voorstuk controleren.

36 %$6,69$$5',*+('(1 3/$$7:(5. a/c A 1 veiligheid 2 wartel H b d 0 tot 2,5 Pa De veer spannen we door de instelschroef UHFKWVRP/OLQNVRP te draaien. De klep 2 staat dan ODQJHU/NRUWHU open, waardoor de druk ODJHU/KRJHU is. c 8000 liter b 3600 liter (170 Ü 80) 10 Pa = Pa drukval = 3600 dm = 3600 liter C H b 450 liter Dissociatie vindt plaats bij een gasdruk boven Pa. c de aceton er uitstroomt ongeveer 5000 liter We stellen de werkdruk in op ongeveer 3 10 Pa. b de veer van het reduceerventiel spanningloos te maken /DVSRVLWLHV c Er ontstaat meer kans op dichttrekken van de vooropening.

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40 %$6,69$$5',*+('(1 3/$$7:(5. =HOIWRHWV 1 d hoge vlamtemperatuur en een klein vlamvolume 2 b alle zuurstof in de vlam te gebruiken voor verbranding 3 b staaldraad met een laagje koper 4 a de vlaminstelling bij a 5 5 b Pa 6 b mengkamer 7 c 6000 liter 8 b smelten we de lasdraad af in de vlam 9 c een goede doorlassing 10 a maken we met de lasdraad een roerende beweging in het smeltbad 11 b V-naad 12 b aan de schroefwartel 13 c lage zuurstofdruk 14 c oxiderende vlam 15 b de lasdraad langer in het smeltbad af te smelten 16 a tijdens het lassen wordt ook zuurstof uit de omgeving verbruikt