7/29/2019 Avesta 2205 Vdx Ac Dc

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AvestaPolarit Welding

AvestaPolarit Welding AB, P O Box 501, SE-774 27 Avesta, Sweden. Tel: +46-226-81500. Fax: +46-226-81575. www.avestapolarit.com/welding

For welding steel such as:

AvestaPolarit EN ASTM SS* BS* NF*

2205 1.4462 S32205 2377 318S13 Z3 CND 22-05 Az* Obsolete national standards, replaced by EN 10088.

Characteristics

AVESTA 2205-VDX-VDX AC/DC has a rutile-acid coating whichprovides very good weldability when working with a positive poleDC. The electrode is designed for welding vertically down and ischaracterised by a steady arc, very little spatter and easy slag removal.

AVESTA 2205-VDX is primarily designed for welding the duplexgrade AvestaPolarit 2205-VDX and similar steel grades, but it can alsobe used for welding SAF 2304 type of steels.

AVESTA 2205-VDX provides a ferritic-austenitic weldment thatcombines many of the good properties of both ferritic and austenitic

stainless steels. Due to the high content of both Cr and Mo a very goodresistance to general and pitting corrosion is obtained. The duplexmicrostructure gives a high tensile strength and hereby also anexcellent resistance to stress corrosion cracking.

AVESTA 2205-VDX is over-alloyed with respect to nickel, to ensurethe right ferrite balance in the weld metal.

Welding directions

AvestaPolarit 2205 should be welded in the same manner as anordinary austenitic stainless steel, i.e. high currents should be avoidedand the material should be allowed to cool to below 150C betweensuccessive passes.

Welding in the vertical down position requires well-adapted

amperages. The degree of difficulty increases from the butt joint,through the corner joint and the lap joint to the fillet joint. In the latter

case of stringent requirements, to interrupt welding and grind the tack

welds. Penetration increases with increasing amperage but also with

increasing electrode inclination in relation to the workpiece, with

maximum penetration being achieved at an angle of 90. However, 60-

70 inclination usually gives the best weldability.However, duplex steels are somewhat more difficult to weldcompared to austenitic steels such as 316L, mainly with respect tofluidity and penetration into the parent metals.

To utilise the good properties of a duplex steel it is of the utmostimportance to obtain a good ferrite content in the weld. This is bestachieved by welding with sufficient root gap (2-2.5 mm), which also

ensures good penetration, by using the right amount of filler metal andby welding with a controlled heat input (0.5-2.5 kJ/mm).

Duplex steels have remarkably lower thermal expansion than forexample 304 and 316 type steels. The deformation and extensionduring welding is therefore somewhat lower

Weld deposit data

Metal recovery approx. 105 %.

Packaging data

Diam.

mm

Length

mm

Weight/

capsule,

kg

Approx. No.

of electrodes/

capsule

Weight/ carton,

kg

2.5 300 1.90 126 11.40

Standard designations

EN 1600 E 22 9 3 N L RAWS A5.4 E2209-17

Typical analysis % (All weld metal)

C Si Mn Cr Ni Mo N

0.02 0.8 0.9 22.8 9.5 3.1 0.15

Ferrite 30 FN (WRC-92)

Mechanical

propertiesTypical

values (IIW)

Min. values

EN 1600Yield strength, Rp0,2 670 N/mm2 450 N/mm2

Tensile strength, Rm 860 N/mm2 550 N/mm2

Elongation, A5 25 % 20 %

Impact strength, KV

+20C 35 J

-40C 25 J

Hardness approx. 240 Brinell

Welding data

DC+ or AC Diam., mm Current, A2.5 50 - 70

Open circuit voltage 70V

Interpass temperature: Max. 150oC.

Heat input: 0.5 - 2.5 kJ/mm.

Heat treatment: Generally none. In special casesquench annealing at 1050C.

Structure: Austenite with approx. 30 % ferrite.

Scaling temperature: Approx. 850C (air)

Corrosion resistance: Very good resistance topitting and stress corrosion cracking in chloride-

containing environments.

Approvals: -

Welding positions

2.5

AVESTA 2205-VDX AC/DC

Covered electrodes