The parent metal surface must be clean and as flat as possible to
ensure maximum weld strength of the Cholblock.

On low alloy surfaces, use E7016 or E7018 rod, or E70T-5 wire.
On manganese surfaces, us E309-16 stainless steel rod.

Do not preheat the Chokblock.

For best results the Chokblock should be clamped and tack welded
into position prior to welding.

Continuous welding should not be used. A maximum run length of
2.0" to 2.75" (50-70mm) should be used to minimize heat input.

The following preheat instructions refer to the heating of the
parent surface only.

Working in temperatures above 40° F (5° C), preheat heavy
sections 1.5 in. (40mm) or greater to 200° F (95° C), no post heat required. Do not preheat if welding on manganese surfaces.

Working in temperatures at or below 40° F (5° C), preheat to
350-400° F (175-205° C). Do not preheat if welding on
manganese surfaces.

Recommended fillet size 1/4" (6mm) minimum.

Ensure welding does not come closer that 1/16" (2mm) from the
joint line between the casting and the backing plate.