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Weld Mold® 4637

4637 is a nickel-based chromium, molybdenum, cobalt alloy commonly known as Waspaloy®.


Because of its excellent high temperature (up to about 1800°F) and high stress performance Waspaloy® is widely used as a wrought material for forged and fabricated gas turbine components. For the same reasons it is gaining popularity as a composite material in the forging industry where it has proven its ability to prolong forging die life.

Cast Iron

Its nickel base and high temperature resistance make 4637 a good candidate for overlaying cast iron die-casting dies used for casting aluminum. Welding on cast iron needs to be done with minimal penetration to minimize dilution of the weld metal with the high carbon cast iron. Special attention must be paid to avoid inclusions or voids caused by cold lapping.


Waspaloy® should be in the solution treated or annealed condition prior to welding. When welding thin sections or butt joints a backing gas may be required. Any unshielded molten or near molten metal is subject to contamination. Good fit up and careful control of arc length and current input will minimize weld restraint. A clean working surface is important. Recommended cleaning methods are chemical descaling, cleaning solvents, vapor blasting (not sand blasting), and emery cleaning. Waspaloy® is a precipitation hardening material hence welded parts should always be resolution treated. Heating welded parts through the aging temperature as rapidly as possible can minimize “Strain-age” cracking.

Heat Treat Procedure

Preheat and interpass temperature 750°F for Waspaloy® base, 500°F for cast iron base. Apply 4637 with a stringer or slight weave and peen deposits to relieve stresses. Postheat 1025°F for 10 hours, furnace cool 100°F maximum per hour. Do not post heat cast iron, slow cool to room temperature.

FCAW - DC+, 92% Ar 8% CO2

Technical Data



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