A process of welding to repair thick sections using two arc welding devices and a laser device

A double-sided tribrid welding technique and apparatus for root pass welding of narrow groove welds is desribed. The welding technique utilizes three welding devices (40, 46, 48), one (40) positioned on the backside (50) of the weld joint opposite the narrow groove, while the other welding devices (...

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Main Authors KOTTILINGAM, SRIKANTH CHANDRUDU, JANAWITZ, JAMISON WILLIAM, LIN, DECHAO, SOUTHER, RON LEE, O'CONNELL, MATTHEW JAMES, BUCCI, DAVID VINCENT
Format Patent
LanguageEnglish
French
German
Published 14.10.2015
Subjects
BLASTING
CLADDING OR PLATING BY SOLDERING OR WELDING
COMBINED OPERATIONS
CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING
ENGINE PLANTS IN GENERAL
HEATING
LIGHTING
MACHINE TOOLS
MACHINES OR ENGINES IN GENERAL
MECHANICAL ENGINEERING
METAL-WORKING NOT OTHERWISE PROVIDED FOR
NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAMTURBINES
OTHER WORKING OF METAL
PERFORMING OPERATIONS
SOLDERING OR UNSOLDERING
STEAM ENGINES
TRANSPORTING
UNIVERSAL MACHINE TOOLS
WEAPONS
WELDING
WORKING BY LASER BEAM
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Summary:A double-sided tribrid welding technique and apparatus for root pass welding of narrow groove welds is desribed. The welding technique utilizes three welding devices (40, 46, 48), one (40) positioned on the backside (50) of the weld joint opposite the narrow groove, while the other welding devices (46, 48) are positioned on the narrow groove side (42) of the weld. The welding apparatus (40) on the backside (50) of the weld joint may strike an arc on the backside (50) of the weld joint, one of the welding apparatus (46) on the narrow groove side (42) of the weld may strike an arc within the narrow groove weld joint, while the remaining welding apparatus (48) is a laser that can help establish a stable keyhole as a common pool of molten metal at the root without burning through the root. Once the arcs are struck substantially simultaneously and the laser is energized, the three welding heads move simultaneously, the arc welders (40, 46) assisting in maintaining pre-heat temperature, while minimizing distortion and cracking. Adjusting arc weld parameters can provide deformation on completion of the root pass so as to compensate for distortion due to metal shrinkage in subsequent passes.
Bibliography:Application Number: EP20130179865