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Union X 55 solid MIG/MAG wire: Böhler Welding wire on a BS300 spool, coppered
Union, solid MIG/MAG wire, high-strength steels

Union X 55 solid MIG/MAG wire

EN ISO classification16834-A G 55 5 M Mn3NiCrMo
AWS classificationA5.28 / SFA-5.28 ER100S-G
Shielding gasM21: Ar with 15 to 25 % CO2
ApprovalsTÜV (19636), CE
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Authorised distributorvoestalpine Böhler Welding
Courier shippingfrom the warehouse in Krotoszyn
Data sheetcomposition, properties, specifications
Wire selectionhelp from a welding engineer
Manufacturer data sheet
Application Specifications Manufacturer datasheet Fits Substitute Bought together
Application

What Union X 55 solid MIG/MAG wire is used for

Union X 55 is a low-alloyed, high-strength solid wire. It suits welding quenched and tempered high-strength steels on mobile structures, machine frames, cranes and parts built for a lower own weight.

The wire suits hand work with a semiautomatic torch and mechanised stations, fed continuously from the feeder and welded under shielding gas.

  • Classification EN ISO: 16834-A G 55 5 M Mn3NiCrMo
  • AWS classification: A5.28 / SFA-5.28 ER100S-G
  • Shielding gas: M21
  • Diameters: 1.0 / 1.2 mm
  • Approvals: TÜV (19636), CE

Keep the hydrogen level low: dry consumables, a clean groove and preheating on greater thicknesses. Check the contact tip, a worn bore upsets the wire feed and causes burnback. Match the drive rolls to the wire diameter and check the liner, wire slip shows up at once in an unstable arc. Match the diameter to the thickness and the position, thinner wires are easier to control in constrained positions.

Manufacturer datasheet

Chemical composition and properties from the manufacturer datasheet

Datasheet PDF

Typical weld metal values from the voestalpine Böhler Welding data sheet, issue 12/2024. The minimum or the range guaranteed by the maker is given in brackets. The figures depend on the heat treatment condition and the shielding gas stated in the row and do not replace testing the joint to your own WPS.

Chemical composition, wt.-%
CSiMnCrNiMo
0,090,701,500,500,550,25
Welding data and approvals
Polaritydirect current, electrode positive (DC+)
Shielding gas to EN ISO 14175M2
ApprovalsTÜV (19636), CE
Datasheet edition12/2024
Mechanical properties of the all-weld metal, typical values
Condition Yield strength Re, MPa Tensile strength Rm, MPa Elongation A, % Impact energy KV, J at 20 °C Impact energy KV, J at -40 °C
u 650 (min. 550) 740 (range 640 to 820) 20 (min. 18) 80 (min. > 47) 65 (min. > 47)
  • u: untreated, as welded
Fits

For which materials and machines

Base materials
  • S420 – S550
Process and machines

Solid MIG/MAG wire, works on any sound machine for this process: welders. Shielding gas: M21: Ar with 15 to 25 % CO2.

Used welders New welders Ask us to help you choose
Technical substitute

A substitute for this consumable

We will find a substitute with the same classification, diameter and shielding gas over the phone: +48 669 162 833.

From the same group

Other consumables for the same material

For comparison before you buy. A technical substitute is listed above.

All: Solid MIG/MAG wires