Weld Coupon Station Basic E.H. Wachs Weld Coupon Station is a self contained tool designed for machining weld preps onto ordinary pre-cut pipe sections, creating weld ready coupons. Wachs Coupon Station will machine virtually any prep including bevels, compound bevels and J-preps on carbon steel, stainless steel, alloy steel and aluminum pipe and tubing. With the optional mandrel assembly included in the deluxe model P08-089-402, it will counterbore from 2.75” to 6.63” I.D. (69.9 – 168.4mm). It’s capable of handling all common coupon sizes up to “Super Coupons” with 2.75” O.D. (69.9mm) and 5/8” wall (15.9mm) and, in the deluxe model, up to a 6” (DN150) schedule 80.