Welding boiler steel

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Welding types of boiler steel

For permanent connection of parts of boiler steel is used electric welding - manual, semi- and automatic (the last two are made under a layer of flux). Manual welding is low-productive, so it is used only for welding small parts (e.g. for welding fittings), as well as the preliminary joining of blanks.) The most productive - automatic - welding of boiler structures is carried out on stationary frame-type welding stations. All boiler steel grades refer to the steels of the first group according to their weldability, so they ensure good quality of welds.

Grades of welding electrodes

Boiler steel grade

steel

Electrode brand Welding wire brand

12МХ; 15ХМ;

А335Р11

TL-38, TL-39, TML-IU,

TSU-2XM, TML-3U, SMV-95*,

SMV-98*, SMV-96*

Chromo 335 sq**, Chromo 910 sq**

Св-08МХ, Св-08ХМА-2,

Sv-08CGSMA.

GOST 2246-70

12Х1МФ,

15Х1М1Ф

TSL-39, TSL-20, TML-ZU,

TSL-45

Св-08ХМФА-2,

Sv-08ChMFA,

Sv-08CGSMFA.

GOST 2246-70

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Annealing modes

To avoid cracking of the material, welding electrodes are hardened before use. Hardening modes, depending on the brand of the electrode, are listed below:

Electrode brand Annealing modes
Temperature, °С Temperature, °C Temperature, °C Duration, h
TM-39, TML-1U, TSU-2HM, TML-ZU, TSL-20, TSL-45 380 ± 20 2,0+ 0,5
ФА-400/10У, ЕА-400/10T, ЦТ-26, ЦТ-26M, ЦТ-15, ЦТ-15K 220 ± 20 1,0 + 0,5

After welding, the mechanical properties of the weld must be similar to those of the base metal.

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