September 2013 www.avestawelding.com

Covered electrodes

Standard designationsEN ISO 3581-A E 23 7 N L R

CharacteristicsAvesta LDX 2101-4D is a thin-coated, rutile-acid type electrodes specially developed for the welding of thin-walled pipes and sheets in the duplex stainless steel Outokumpu LDX 2101, a lean duplex steel with excellent strength and medium corrosion resistance. Pipe welding can be performed in several different ways. One possi- bility is to start welding in the overhead position (1), followed by vertical-down on both sides from the 12 oclock position (2 and 3). Another possibility is to start at the 7 oclock posi-tion and weld vertical-up to the 11 oclock position on both sides. This requires an inverter power source with a remote control. To bridge large root gaps DC is often preferred. The weldability of duplex steels is excellent but the welding should be adapted to the base material, considering fluidity, joint design, heat input etc. For detailed welding recom-mendations, please see "How to weld duplex stainless steels" or contact voestalpine Bhler Welding.

Welding dataDC+ or AC Diam, mm Current, A

1.60 15 352.00 25 502.50 30 80

Weld deposit data (max. welding current)Metal recovery approx. 110%.

Typical analysis % (All weld metal)

C Si Mn Cr Ni Mo N0.03 0.9 0.6 23.5 7.4 0.4 0.16

Ferrite 45 FN WRC-92

Mechanicalproperties

Typicalvalues (IIW)

Min. valuesEN ISO 3581

Yield strength Rp0.2 640 N/mm2 Tensile strength Rm 800 N/mm2 Elongation A5 25 % Impact toughness KV +20C 45 J 40C 28 JHardness approx. 260 Brinell

Interpass temperature: Max. 150C.

Heat input: 0.5 2.0 kJ/mm.

Heat treatment: Generally none (in specialcases quench annealing at 1020 1080C).

Structure: Duplex (austenite with 30 50% ferrite).

Scaling temperature: Approx. 850C (air).

Corrosion resistance: Good resistance togeneral corrosion. Better resistance to pitting, crevice corrosion and stress corrosion crack-ing than 1.4301/AISI 304.

Welding positions

Avesta LDX 2101-4DFor welding steels such asOutokumpu EN ASTM BS NF SS

LDX 2101 1.4162 S32101

1.62.5