GTAW (TIG) Procedure for Tool Steels
Identify the tool steel to be welded. While there are many variations of the tool and die steels, the most common are:
Prepare the surface to be welded. Remove all foreign matter and rough edges. Make sure that only the original base metal is exposed.
Select the proper electrode per the chart. Preheat the tool steel to be welded per the chart.
Use AC or DC, reverse polarity, with the lowest possible amperage setting for good fusion.
Using a striker plate, carry the arc to the area to be welded.
Maintain preheat temperature while welding.
Two or more passes should be used to minimize dilution of the base metal. Peen each pass rapidly to stress relieve.
Postheat or temper the deposit per the chart.
If heat treating is desired, use the annealing, hardening and quenching recommendations in the chart.
For checking proper welding temperature, use a temperature indicator.
With reference to "Step 7" above, 3-SMW is recommended as a "cushioning" or "padding" pass adjacent to the base metal. This minimizes dilution of the base metal and offers a softer, more ductile alloy next to the higher hardness base metal. 3-SMW does not respond to heat treatment, so it should not be exposed to the finished weld area. 3-SMW also has less hardness than the tool steel overlay.
|Water hardening||W-1 through W-5|
|Oil Hardening||O-1 through O-6|
|Air Hardening||A-2 through A-10|
|High Speed||M-1 through M-44|
|Hot Work||H-10 through H-43|
Shielding Gas: Argon is recommended as the shielding gas.
Sizes Available: Each of these Aufhauser (GTAW-TIG) tool steel alloys (also Aufhauser 3-SMW) are offered in the following sizes:
Packaging: All sizes are packed in five pound tubes, four tubes per twenty pound carton.
Use the following chart as a guide in the effective and economical salvage of costly tools and dies:
|Preheat °F||Anneal °F||Harden °F||Post-Heat °F||Quench|
|48 - 52||300 - 1000||1500 - 1600||1750 - 1850||300 - 1000||Air|
|48 - 56||250 - 400||1425 - 1450||1425 - 1500||250 - 400||Oil|
|52 - 58||275 - 450||1425 - 1450||1425 - 1450||275 - 450||Water|
|High Speed Steel||3-HSS||1/16
|003WH30||58 - 63||1000||1600||2200 - 2225||1000||Oil|
|52 - 55||900 - 1200||1500 - 1600||1750 - 1850||900 - 1200||Air|
|45||800 - 900||Use S.A.E. 4130 Procedure|