Types of Cladding Techniques
Clad inlays or overlays may be bonded to the base material by a variety of methods including pressure, heat, coextrusion, arc welding, brazing, laser, roll bonding, explosive bonding, and weld overlaying. Weld overlay is the most common technique used for Oil and Gas pipe cladding and is simply the use of welding to join the high-performance alloy to the base material.
Weld overlay offers significant flexibility and versatility. This technique is able to accommodate complex geometries and large part sizes. It also provides outstanding corrosion protection and longevity without sacrificing thickness or other critical design parameters.
There are several different types of welding techniques available for Inconel or other alloy cladding, each with its own set of pros and cons. In general, Tungsten Inert Gas (TIG) welding, also known as Gas Tungsten Arc Welding (GTAW) is the most common method. TIG, or GTAW, offers more precision and control than most of the other weld overlay methods, especially when working with Inconel. In some cases, the Inconel wire is heated before reaching the arc, a process referred to as hot wire TIG, which enables a higher deposition rate and more rapid welds without sacrificing quality. Many GTAW processes are automated, leading to even higher levels of precision and quality in the welds.
Automated Cladding and Subsea Capabilities
ABS offers a variety of cladding services. Equipped with the most advanced, fully-automated hot wire tig machines, we support global OEMs with our cladding services. Complementing our massive installation of large boring mills and VTL’s, our cladding cells are designed to handle all ranges of weight and size requirements in the industry. At ABS, we specialize in Inconel 625 hotwire TIG cladding as well as sub-arc cladding. Complementing our Hot Wire Tig Cladding Cells, ABS Machining’s large installation of advanced Sub-Arc Cladding cells allow us to offer heavy deposit welding of Inconel 625, stainless steel and steel-on-steel applications. Naturally keeping with our foundations of limiting size restrictions, our Sub-Arc cells are specifically designed to handle the largest and tallest Blow-Out Preventers on the market. Positioners are designed to allow ABS to weld both horizontally and vertically for access on all 5 sides. For more on ABS subsea cladding, watch our brief video. Our team specializes in the following applications:
- Ram Blow Out Preventers (BOPs)
- Annular Blow Out Preventers
- Wellhead Risers/Connector
Our team also has robust welding certifications. Within our cladding department, ABS has invested a tremendous amount of capital and research to certify our weld procedures in lab and by ABS and DNV. These procedures further ensure the parameters we have chosen meet the requirements of our customers. Our subsea ABS and DNV approved WPS weld procedures meet:
- ASME Sec. IX,
- API 6A & 16A / NACE MR0175
- ISO 15156-X, DNV-OS-E101 Applications