A luminum Stud Welding Technologies
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Copyright © Nelson Stud Welding, Inc. Aluminum Stud Welding Technologies May 10-11, 2011 2011 AWS Conference and Exhibition Welding in Shipbuilding 1 By Chris Hsu and Clark Champney Nelson Stud Welding, Inc.
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A luminum Stud Welding Technologies. By Chris Hsu and Clark Champney Nelson Stud Welding, Inc. . Challenges. Low melting point High thermal conductivity Tough oxide (3488F) Spatter Softening. Drawn Arc Stud Welding 101. A. Pilot Arc. B. Lift Main Arc. C. Plunge. D. Remove - PowerPoint PPT Presentation
Transcript of A luminum Stud Welding Technologies
Copyright © Nelson Stud Welding, Inc.
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Aluminum Stud Welding Technologies
May 10-11, 20112011 AWS Conference and Exhibition Welding in Shipbuilding
By Chris Hsu and Clark ChampneyNelson Stud Welding, Inc.
Copyright © Nelson Stud Welding, Inc.
2
Challenges
May 10-11, 2011
Low melting point
High thermal conductivity
Tough oxide (3488F)
Spatter Softening
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Drawn Arc Stud Welding 101
May 10-11, 2011
A.Pilot Arc
B.Lift
Main Arc
C.Plunge
D.RemoveChuck
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Capacitor discharge
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CD welding Process Weld time
Timing tip Plunge speed
Current Cap voltage Cable impedance
Contact Gap Stored Arc
May 10-11, 20112011 AWS Conference and Exhibition Welding in Shipbuilding
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MIL specifications
MIL-S-24149/2D: aluminum stud and ferrule for drawn arc
MIL-S-24149/5C: aluminum stud for CD and stored arc
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Gun accessories
Gas foot Tranquil arc
plunge dampener
Motorize gun
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plate thickness to stud diameter ratio Develop full strength Steel: 1/3 Aluminum (Al is annealed in stud
welding) ½ for drawn arc ¼ for CD
AWS Seattle May 10, 2011
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Weld strength: tensile/torque
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Internally threaded studs Diameter ¼” to
½” Threads #10-24
thru ½-13 5000 series
alloy used for stud (Magnesium based)
LNG tankersAWS Seattle May 10, 2011
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Cut oxide, rust, oil, mill-scale
Reduce heat input backside marking
Stiffen arc Out of position Angle iron
Aluminum Peak: cathodic
clean Background: heat
May 10-11, 2011Stud Welding Technologies – ShipTech 2011
Pulse cleaning and welding
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Process monitor & loggerWelder, Gun and Cable Weld energy
Stud hang-up Cold plunge Cable overheat Weld Pass / Fail Production log
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Normal Cold
Hang-up
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Summary CD - contact, gap and stored arc Drawn arc
Pulse AC
Up to ½” can be welded down hand and plate vertical Inverter to weld 5/8” and ¾” in flat position Process monitor
Drawn arc CD
May 10-11, 20112011 AWS Conference and Exhibition Welding in Shipbuilding
