Evaluating the use of homopolar pulsed welding of high-strength steel pipe

Journal Article · Fri Jan 01 04:00:00 EST 1993 · Welding Journal (Miami); (United States)

OSTI ID:5990324

Trevisan, R E ^[1]; Harville, M W; Gully, J H ^[2]

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1. State Univ. of Campinas, Sao Paulo (Brazil). Dept. of Manufacturing Engineering
2. Univ. of Texas, Austin, TX (United States). Center for Electromechanics

Homopolar pulsed welding (HPW) is a solid-state welding process that relies on a pulse of direct current from a homopolar generator (HPG) to heat the contacting surfaces of two or more work pieces to forging temperature, at which time upset force is applied and a forged joint is formed. Heat input is concentrated at the interface, due to the constriction resistance between contacting surfaces--this resistance is a function of contact pressure and surface preparation. Welding time is very short (typically 3.0 s or less), thus minimizing time-at-temperature and related metallurgical effects. No flux or filler is used and welding time is independent of weld cross-sectional area. Homopolar generators are reliable energy-storage machines capable of delivering high power and unidirectional current at low voltage to a resistive or inductive load. The present work was undertaken to evaluate the properties of a preliminary HPW joint of API 5L grade X-52 pipe. Conventional metallographic, microhardness and fracture toughness techniques were used for this evaluation.

• OSTI ID: 5990324
• Journal Information: Welding Journal (Miami); (United States), Journal Name: Welding Journal (Miami); (United States) Vol. 72:1; ISSN 0043-2296; ISSN WEJUA3
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
ALLOYS
DATA
ELECTRIC GENERATORS
ELECTRONIC EQUIPMENT
EQUIPMENT
EXPERIMENTAL DATA
FABRICATION
HEAT AFFECTED ZONE
HOMOPOLAR GENERATORS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
JOINING
MECHANICAL PROPERTIES
NUMERICAL DATA
PIPES
POWER SUPPLIES
STEELS
WELDING
WELDING MACHINES
ZONES