Har-Lon Contracting

06/01/2026

06/01/2026

Livestock sliding gate job today, great clients, fun new projects!

05/29/2026

Ancient plainer! Cool old piece of mill equipment!

05/28/2026

After hours fan bearings and alignment job this week. Made some modifications to motor base for easy adjustment and got it back in and tested.

04/21/2026

Making some adjustments to keep these dang rocks on the belt, stay tuned for final results

04/21/2026

Knowing a thing or 2 about ball mills, this would be a pretty intense process!

A through-wall crack developed in the hardened steel shell of a 36-foot diameter ball mill due to heavy ore impact. I stopped the mill and cleared the grinding media. I gouged out the crack on both sides of the shell using an air carbon arc torch to create a double-V groove. I preheated the shell area to 450°F using propane torches. I welded the repair using E8018-C2 low hydrogen electrodes to match the tensile strength of the mill shell. I used a backstepping sequence, welding 4-inch beads from the center outward to control shrinkage stress on the cylindrical shell. I alternated welding from the inside to the outside to balance the heat input. I deposited a total of 22 layers. After welding, I wrapped the area in ceramic blankets to simulate a slow cool. The mill was restarted and ran at full load for 48 hours with no vibration.