FIELD: technological processes.
SUBSTANCE: invention may be used in repair of pipelines that operate at high temperatures in carbonising atmospheres. Welding is carried out with preliminary heating of up to 730…750°C. After welding, welded joint is annealed at temperature of 700…750°C for 50…70 minutes with thickness of carbonised layer of more than 1 mm to 3 mm or without annealing with thickness of carbonised layer up to 1 mm. Welding is carried out with application of pulse-arc welding method with rectangular shape of current pulses with duration of current pulse of 250…300 ms and duration of pause current of 260…310 ms.
EFFECT: quality welded joining of pipes.
2 dwg, 2 tbl, 2 ex
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF ENAMELED PIPES WELDING ENSURING INTERNAL PROTECTION OF WELD JOINT | 2007 |
|
RU2344910C1 |
| METHOD OF ELECTROARC FACING BY MODULATED CURRENT | 2006 |
|
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| ELECTRODE FOR WELDING REFRACTORY ALLOYS | 2009 |
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| METHOD FOR WELDING ARTICLES OF CAST IRON WITH SPHEROIDAL GRAPHITE AT MOUNTING THEM | 2003 |
|
RU2257984C2 |
| CONTROL OVER WELDING OF PIPELINES FROM HIGH-STRENGTH PIPES WITH CONTROLLED HEAT INPUT | 2014 |
|
RU2563793C1 |
| METHOD OF MAKING WELDED JOINT ROOT PASS BY NONCONSUMABLE ELECTRODE IN PROTECTIVE GASES | 2008 |
|
RU2381092C2 |
| METHOD OF MANUAL MODULATED-CURRENT ARC WELDING BY CONSUMABLE ELECTRODE | 2009 |
|
RU2418659C1 |
| METHOD FOR MANUAL ELECTRIC-ARC WELDING OF ROOT SEAM WITH USE OF CONSUMABLE ELECTRODE AND MODULATED ELECTRIC CURRENT | 2006 |
|
RU2322331C1 |
| ELECTRIC ARC WELDING METHOD BY MEANS OF CONSUMABLE ELECTRODE WITH PULSE MODULATION OF CURRENT | 2004 |
|
RU2268809C1 |
| METHOD OF MANUAL ELECTRIC ARC WELDING ROOT JOINT USING CURRENT MODULATED CONSUMABLE ELECTRODE | 2008 |
|
RU2371288C1 |
