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UDDEHOLM NIMAX TIG-WELD

This information is based on our present state ofknowledge and is intended to provide generalnotes on our products and their uses. It shouldnot therefore be construed as a warranty of spe-cific properties of the products described or awarranty for fitness for a particular purpose.

Classified according to EU Directive 1999/45/ECFor further information see our “Material SafetyData Sheets”.

Edition: 1, 01.2010

Diameter Lengthmm inch mm inch

1.0 0.04 1000 401.6 0.06 1000 40

NIMAX TIG-WELD

Welding ofUddeholm NimaxGeneralWhen welding Uddeholm Nimax there will notbe increased hardness in the heat affected zone(HAZ). The hardness profile will be even.Therefore polishing and photo-etching can bemade with good result without heat treatmentafter welding, providing a suitable filler materialis used.

Cleaning of toolThe surfaces in the vicinity of the intendedrepairs/adjustment areas should be cleaned tobase metal prior to welding. Clean the toolcarefully with degreasing agent or by grinding.Make sure that the cavity surfaces are pro-tected during welding, especially if these arepolished.

Joint preparationFor a satisfactory result, it is imperative that theregion to be welded is carefully prepared.Cracks should be ground out so that the jointbottom is well rounded and such that the sidesmake an angle of at least 30° to the vertical.Any damage occurring during welding shouldbe ground down to “sound steel” before re-welding.

Gas Tungsten Arc WeldingWelding method GTAW/TIG

Filler metal NIMAX TIG-WELD

Hardness as welded ~ 40 HRC

Welding of mould steelUddeholm Nimax TIG-Weld is a TIG filler rodspecially composed as to be compatible withthe mould steel Uddeholm Nimax.

Uddeholm Nimax TIG-Weld gives a weldmetal identical in composition to UddeholmNimax and is characterized by:

• very good melting properties

• high impact and fracture toughness

• good polishing and texturing properties

Preheating temperaturePreheating is not necessary but if it is desired atemperature at 150–200°C (300–390°F) isrecommended.

The temperature in the vicinity of the weldshould not exceed 300°C (570°F) (interpasstemperature). When passed the risk of distor-tion increases.

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Post treatmentPost treatment is normally not required.However, in cases when high strain could beexpected (for example deep groove prepara-tions, large welded areas and fillet welds) astress relieving at 450°C (840°F) for 2 hours isrecommended.

Heat treatment above 500°C (930°F) shouldbe avoided because it will reduce the hardnessas well as the toughness of Uddeholm Nimax.

Building up the weldThe root runs should be done with low heatinput (max. current 120 A).

The first two layers should always be weldedwith the same low heat input, while a greaterheat input can be used for the remaining layers.At least two runs (even for small repairs) arerecommended. Do not oscillate.

The transition region between the weld andthe base material should be carefully inspectedprior to stopping welding. Undercut should berepaired before further processing.

After welding, the final layer of weld metalshould be ground away prior to any heattreatment.

If the tool is to be polished or photo-etchedTIG welding is to be preferred.

For more detailed information, see theUddeholm brochure “Welding of Tool Steel”.

UD

DEH

OLM

100102

FURTHER INFORMATION

Please contact your local Uddeholm off ice for further information on the selection, heat treatment, application andavailability of Uddeholm tool steel. For more information, please visit www.uddeholm.com or www.assab.com

Uddeholm Nimax photo-etched after welding.