Section / Terminology
Glossary
Plain definitions of the hardbanding, hardfacing and drill string terms used across the field notes on this site.
30 terms defined- Abrasive hardband
- A hardbanding alloy engineered to maximize tool joint wear resistance, typically containing hard carbides. It extends drill pipe life but aggressively wears casing during contact. Related article →
- Acceptance criteria
- The documented standards a hardbanding deposit must meet before pipe returns to service, covering crack limits, porosity, hardness, geometry, and coverage continuity. Related article →
- Casing wear
- Progressive metal loss on the inner wall of oilfield casing caused by rotating drill pipe tool joints, exacerbated by hard or poorly applied hardbanding. Related article →
- Casing-friendly hardband
- A hardbanding alloy formulated to protect drill pipe tool joints while minimizing casing damage, using metallurgy that resists abrasion without cutting into casing steel. Related article →
- Chromium carbide hardband
- A hardfacing alloy with chromium-rich carbides in a iron-based matrix, offering good abrasion resistance at lower cost and generally more casing-friendly behavior than tungsten carbide. Related article →
- Cooling rate
- The speed at which a hardbanding deposit and heat-affected zone cool after welding. Controlled cooling prevents cracking, hardening, and residual stress in tool joint steel. Related article →
- Crack-free alloy
- A hardbanding alloy depositable without check or cross-check cracks, using crack-tolerant metallurgy rather than relying on controlled crack patterns for stress relief. Related article →
- Directional drilling
- Drilling techniques that steer the wellbore along a planned trajectory, increasing side loading between drill pipe and casing and raising the importance of hardband selection. Related article → Wikipedia ↗
- Downtime cost
- The total financial impact of drilling interruptions caused by equipment wear or failure. Avoiding tool joint and casing failures through hardbanding offsets rig day-rate expenses. Related article →
- Drill pipe
- The tubular steel string that transmits drilling fluid and rotation from surface to the bit. Its tool joints carry the threaded connections and receive hardbanding protection. Related article → Wikipedia ↗
- GMAW
- Gas metal arc welding, the most common process for applying hardbanding to tool joints, depositing cored or solid wire with shielding gas at high travel speed. Related article → Wikipedia ↗
- Hardbanding
- The application of wear-resistant weld deposits onto drill pipe tool joints and other oilfield components to extend service life and reduce downhole metal loss. Related article →
- Hardfacing
- The broader practice of depositing hard, wear-resistant alloy onto a metal surface by welding. Hardbanding is the oilfield-specific application of hardfacing to drilling assemblies. Related article →
- Hardness testing
- Measurement of deposit resistance to indentation, commonly by Rockwell or HRC methods, used to verify that hardbanding meets specified wear-protection levels. Related article → Wikipedia ↗
- Heat-affected zone
- The region of base metal adjacent to a weld whose microstructure and properties are altered by welding heat. Excessive heat input in hardbanding can soften or crack this zone. Related article → Wikipedia ↗
- Interpass temperature
- The temperature of the weld area between passes, maintained between a specified minimum and maximum to prevent cracking and ensure consistent hardbanding deposit properties. Related article →
- Magnetic particle inspection
- A non-destructive test that reveals surface and near-surface cracks in ferromagnetic steel by applying magnetic fields and iron particles. Used to screen tool joints after hardbanding. Related article → Wikipedia ↗
- Non-magnetic drill collar
- A drill collar made from austenitic or other non-ferromagnetic alloy so downhole survey tools can read the earth's magnetic field without interference. It requires special hardbanding practices. Related article →
- Non-magnetic hardbanding
- Hardbanding alloys and procedures that avoid magnetizing non-magnetic drill collars, which would interfere with measurement-while-drilling and directional survey instruments. Related article →
- Oilfield fabrication
- The shop processes supporting hardbanding work, including pipe handling, rotation equipment, welding stations, and quality systems specific to oilfield tubular components. Related article →
- Pin and box
- The male (pin) and female (box) threaded tool joint ends of drill pipe. Hardbanding is applied to the box and pin shoulders and exterior surfaces that contact casing. Related article → Wikipedia ↗
- Portable hardbanding machine
- A field-deployable welding lathe or positioner that clamps and rotates pipe at the wellsite or pipe yard, enabling hardbanding without transporting pipe to a shop. Related article →
- Preheat
- Heating the tool joint to a specified temperature before welding to reduce cooling rates, drive off moisture, and prevent cracking in both the hardband deposit and base steel. Related article →
- QA checklist
- A structured verification list confirming every quality requirement is met before hardbanded pipe ships, covering procedure records, inspection results, marking, and documentation. Related article →
- Re-application
- Applying new hardbanding over an existing deposit, requiring evaluation, possible removal, and surface preparation to ensure fusion and avoid defects at the interface. Related article →
- Shop hardbanding machine
- Fixed welding lathe equipment in a fabrication shop offering precise rotation, preheat control, and controlled environment for consistent, high-volume hardbanding. Related article →
- Tool joint
- The thicker, threaded connection welded to each drill pipe end. Tool joints carry torque and sealing loads and are the primary location for hardbanding deposits. Related article →
- Tungsten carbide hardband
- Hardbanding containing tungsten carbide particles in a weld matrix, delivering extreme abrasion resistance for drilling conditions where casing contact is minimal or acceptable. Related article → Wikipedia ↗
- Visual inspection
- The first-line examination of hardbanding for cracks, porosity, undercut, spatter, and geometry, performed before instrumented testing and documented against acceptance criteria. Related article → Wikipedia ↗
- Welding procedure specification
- The controlled document defining all essential hardbanding variables, including alloy, process, preheat, interpass limits, travel speed, and post-weld treatment. Related article →