1.1 Ol kromium molibdenum hat i save sakim stiel
Chromium and molybdenum are the main alloy elements, pearlite heat-resistant steel significantly improve the high temperature strength and high temperature oxidation resistance of metals, but they make metal welding performance, welding seam and heat affected zone in which has a high tendency, quenching in air cooling after welding is easy to produce the hard and brittle martensite structure, not only affects the mechanical properties of welded joint, and produce a lot bilong stres, Olsem na kol krek tendency.
Olsem na, bikpela hevi bilong hat resisten stiel welding em ol krek, na fomesen bilong ol krek em tripela samting: straksa, stres na haidrojen konten long weld, olsem na em i bikpela samting tru long kamapim wanpela gutpela welding proses.
2.1 grov
Groove processing is usually done by flame or plasma cutting process. When necessary, cutting should also be preheated, and PT inspection should be done after polishing to remove the cracks on the groove. Usually choose v-type groove, groove Angle is 60℃, from the point of view of preventing crack, groove Angle is more favorable, but increase the welding amount, and grov na insait long tupela sait bilong graun i klinim, rausim oil, ros na wara na ol narapela pipia (haidrojen, stopim porosity).
2.2 set long
Rikwes i no inap strongim grup long stopim long kamapim hevi insait, bikos long bikpela kromium molibdenum aloi steel krek tendency bilong en, olsem na, taim weldim seam bilong konstraksen digri i no bikpela tumas, WeChat pablik namba: king bilong weldim, bai i no ken kamapim strong tumas strong, moa yet long tikpela plet welding, stopim weldim fri srink bilong bras bilong bras, stopim weldim fri shrinkage bilong bras bilong bras, stopim weldim fri srink bilong bras bilong bras, stopim weldim fri shrinkage bilong bras bilong bras, stopim weldim fri shrinkage bilong bras bilong bras.
2.3 Seleksen bilong weldim rot
Long nau, ol rot ol i save yusim ol rot bilong weldim long paiplain long ol petrolium na petrokemikel instolesen yunit i GTAW long daunbilo na elektrod ark weldim bilong kava. Ol narapela rot bilong weldim i gat MIG weldim, CO2 ges welding, elektroslag weldim na otomatik sabmerej ark weldim, na otomatik sabmerej ark welda.
2.4 Seleksen bilong ol samting bilong weldim
Prinsipol bilong makim ol weldim samting, aloi komposesen na strong pefomens bilong weld metal i mas stap wankain wantaim indeks bilong beis metal o i mas kamap long mak bilong pefomens i daunbilo tru long ol teknikel kondisen bilong prodak. Na long daunim haidrojen konten i mas stap wantaim alkaline low haidrojen taip elektrod, elektrod o fluks i mas stap bihainim ol provisen, drain teknoloji, wantaim em i mas bihainim ol provisen, elektrod o fluks i mas stap bihainim ol provisen, draipela teknoloji, wantaim em long em i mas bihainim ol provisen, draipela teknoloji, elektrod o fluks i mas stap bihainim ol provisen, drain teknoloji, wantaim em i mas bihainim ol provisen, elektrod o fluks i mas stap bihainim ol provisen, drain teknoloji, wantaim em i mas bihainim ol provisen, elektrod o fluks i mas stap bihainim ol provisen, elektrod o fluks i mas stap bihainim ol provisen, elektrod o fluks i mas stap bihainim ol provisen, draipela teknoloji, wantaim em i mas bihainim ol provisen, elektrod o fluks i mas stap bihainim ol provisen, draipela teknoloji, wantaim em long em i mas bihainim ol provisen, draipela teknoloji, elektrod o fluks i mas stap bihainim ol provisen, draipela teknoloji, wantaim em long ol samting i stap insait long en. increases with the increasing use in heat insulation barrels, electrode to no more than 4 hours in the heat insulation barrels, otherwise should resume drying, drying times shall not be more than three times, in the process of concrete construction, have detailed provisions. Austenitic stainless steel electrode, such as A307, can also be used for manual arc welding of chromium-molybdenum heat resistant steel, but it still i nid blong gat prehited bifo weldim. Meod ia i stret long situesen we ol welding pat oli no save tritim afta we oli weldim.
2.5 pretemating
Preheting em i wanpela bikpela teknoloji mak bilong kol krek na stres eliminasen long weldim pearlite hat-resistant stiel. Bilong mekim gut weldim kwaliti, prehetim na lukautim wanpela kain tempereja rein i mas kamap long tupela spot fiksing na weldim proses i mas kamap.
2.6 I isi long mekim kol bihain long weldim
Bihain long weldim slo kol em i as tingting bilong weldim kromium molibdenum hat resisten stiel i mas bihainim strong, maski long hotpela taim bilong san i mas mekim dispela, jeneral bihain stret long weldim wantaim asbestos laplap i karamapim wel na klostu long hap bilong simen, ol liklik weldim samting ol i ken putim long asbestos laplap bilong kolt slot i slow. .
2.7 tritmen bilong hat bihain long weldim
Hat tritmen i mas kamap bihain stret long weldim long rot bilong stopim dilei kreking, rausim stres na kamapim gut maikrostraksa.
