HAH specializes in stub welding of alloy steel and non-magnetic stainless steel drilling tools.

During the life cycle of a drilling tool, it will undergo several joint reworks or be taken out of service. Our stub welding services allow for adding material to the end of drilling tools and post-weld machining to restore the tools to their new dimensional condition. HAH stub welding services can reduce your total cost of ownership by increasing the overall life of your equipment.

Method of Stub Welding

Our specialized welding methods, such as Submerged ARC, Hot Wire GTAW, and Friction Welding, produce the best weld possible. Our stub welding systems are fully automated, ensuring repeatable welds at the highest quality level. Each weld is inspected to ensure the absence of any defects in accordance with ASME BPVC Section IX.

1. Submerged ARC: This welding process requires a continuously fed consumable solid or tubular electrode. The molten weld and arc zone are protected from contamination because they are “submerged” under granular flux, which provides a current path between the deep weld penetration and minimizes spatter.

2. Hot Wire GTAW: This process uses a tungsten electrode to produce the weld. A constant current is conducted across the arc through a column of ionized gas. This method allows for more control over the weld than others, resulting in stronger, higher-quality welds.

3. Friction Welding: This solid-state welding process generates heat through mechanical friction, which, along with additional lateral forces, causes plastic displacement and joins materials into a part. Friction welding forms each part, resulting in excellent metallurgical properties of the joint. Since there is no melting, solidification defects such as gas porosity and segregation do not occur.