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Weld Mold® 9210-T

Weld Mold 9210-T is a perfect match for A.I.S.I. P-20 tool steels. Weld Mold 9210-T bare rods have a very carefully balanced analysis with the correct amount of deoxidizers added allow Weld Mold P-20 to be applied consistently without porosity, cracks, etc., when correct welding procedures are followed.


Weld Mold 9210-T bare rod is used to repair all A.I.S.I. P-20 tool steel. They can also be used to overlay working areas of lower alloy steels in order to obtain more wear-resistant surfaces. Weld Mold 9210-T can also be used to repair higher alloy tool steels like H-11, H-12, and H-13, when machinability is a primary concern. Weld deposits of Weld Mold P-20 can be heat treated and tempered to desired hardness, plus they can be Carburized or Nitrided to higher hardness levels of 57-58 RC. The weld deposits will polish to a very high luster.


All areas to be welded must be free of cracks, oil, dirt and any other foreign matter. If someone has used the torch to weld any copper or aluminum based alloys the tungsten, cup, and collet must be replaced. Apply stringer beads, maintain interpass temperature, and use the smallest diameter electrode and least amperage consistent with good welding practices. Preheat to 600ºF. Preheat determines the rate of cooling, which in turn, drastically affects the ultimate RC hardness.

Effects of Cooling (as welded)

Preheat   Air Quench   Slow Cool
NO   48-52 RC   48-49 RC
300ºF   47-54 RC   42-45 RC
400ºF   48-51 RC   40-43 RC
500ºF   45-48 RC   37-38 RC
600ºF   43-47 RC   36-38 RC
700ºF   43-47 RC   37-39 RC
800ºF   40-42 RC   40-42 RC
900ºF   37-40 RC   37-40 RC
Note: When weld deposit is to be etched, the parent block must be preheated to 900ºF. and that heat held during the entire welding operation. Welded unit must be cooled to room temperature and then tempered at 900ºF. If these specific instructions are not followed, the welded unit will not perform correctly in a graining operation.

Mold manufacturers generally require a RC hardness of 33-34. An 1100ºF temper is required to obtain this hardness. Tests made at 1150ºF show the hardness in some cases dropping to 30-31. It is best to stay at 1100ºF when possible.



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