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Dual Furnace Investment Casting

Highest Precision and Consistency


What sets Hathaway apart begins with how it is con­structed. It is made by the highly precise and consistent dual furnace investment casting (DFIC) process that is usually reserved for casting medical instruments.

Golfers shopping for equipment frequently ask why there is such a large disparity in price between two titanium heads that are identical in appearance. Excluding markup and marketing expenses, the difference between the two heads is how they are made. There are two methods used to make titanium driver heads, stamping and casting.

Forging/Stamping

The stamped head derives its name from the 500-ton press used in its produc­tion. The stamped heads are actually made by cutting and stamping a sheet of titanium into several different parts of the driver and then weld­ing them together.  The most common construction is a 4-piece body in which the driver head is made up of a crown, sole plate, face and hosel. The face could be made of Beta Ti or 6-4 Ti, the crown 6-4 Ti or grade 9 Ti, and the sole grade 2 Ti. Grade 2 Ti is used because it is soft and easier to form the intricacies that are common to a sole plate design.

The principle benefit of the stamping process is its low production cost. The disadvantages are limited design complexity, poor reproducibility, and inferior dimensional accuracy. In addition, with the massive amount of weld line inside the club head, perimeter weighting is incon­sistent. Its center of gravity is more a case of probability than predictability. The great majority of titanium wood heads and nearly all component titanium drivers are made by the forging process.

 

Investment Casting

The cast titanium driver usually has a 2-piece body com­posed of the main body and the club face. The main body is made of 6-4 Ti and the club face of either Beta Ti or 6-4 Ti. The face is attached to the body by either an Arc weld­ing or Plasma welding process. The preferred method is Plasma welding, as it is much hotter than Arc weld, creat­ing a stronger bond and a thinner weld line. The titanium investment casting employs a lost wax process, not unlike casting stainless steel. The highly accurate DFIC process requires a melting furnace and a separate casting fur­nace. These vacuum furnaces and related factory fixtures require substantial capital investment. 

The benefits of the DFIC process are thinner wall thick­ness, complex geometry, reproducibility and dimensional accuracy. The main disadvantage is that its production cost is nearly twice that of the stamping process. Nearly all top of the line name brand titanium drivers are made by some form of the investment casting process for its consistency and accuracy.

The Hathaway V4 and V6 adjustable and interchangeable drivers are made by the DFIC process with a 6-4 Ti body and a plasma-welded, Beta Ti Dual Face.