spot welding m/c for welding Aluminium sheets of 2.5 mm thickness

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Dear sirs,

Please suggest a suitable kva of the m/c for spot welding of 2.5mm thick Alu sheets. The welding location is about 1.3 meter from one edge. What would be the minimum kva required for such application ? Please reply. Thank you all.

-- Ranjit (ronjitsinha@yahoo.com), May 25, 2001

Answers

KVA is not the question. The question is "Type of weld required and machine capabilities required".

Commercial quality welding I would anticipate a machine requiring approximately 45,000 amp secondary and 2,000 Lbs. ram force with fast follow-up.

Military Specifications will require approximately 80,000 amp secondary, and 7,000 Lbs. ram force with fast follow-up and forge control.

Due to your minimum 1.3 meter throat requirement I would suggest the use of DC or Three-Phase equipment. The required weld amperage is within a 90 to 100 KVA DC or three phase machine.

If I may be of any further assistance, please contact me direct as shown below.

Bob Balla T. J. Snow Company, Inc. 6207 Jim Snow Way Chattanooga, TN 37421 Phone: 423-894-6234 423-308-3161 (direct line) Fax: 423-892-3889 e- mail: bobballa@tjsnow.com

-- Bob Balla (bobballa@tjsnow.com), May 25, 2001.


I need two more pieces of info: What alloy is the alum? Are you going for commercial spec welds or military spec. welds? With that info,I can make recomendations. [message edited]

-- thomas n. mitchell (info@atekcorp.com), May 25, 2001.

Mr. Mitchell,

Would you please try to keep your discussion on this bboard. The reason for it is to not find customers, but to create a place to discuss resistance welding problems where they will be preserved and available to others in the community.

Taking a discussion off the list prevents this from happening.

Thanks!

-- Sam Snow (2snows@mailandnews.com), May 25, 2001.


I dont quite know what you were referring to towards Mr.Mitchell, as it appears that he might be asking to contact the individual directly and take it off the discussion board, we all enjoy these discussions to remain on this board as a learning center. Please mr Sam Snow, please inform ALL parties to that same standard. "The reason for it is to not find customers, but to create a place to discuss resistance welding problems where they will be preserved and available to others in the community." Taking a discussion off the list prevents this from happening." "If I may be of any further assistance, please contact me direct as shown below. Bob Balla T. J. Snow Company, Inc"

ALL parties should follow this same guidelines.

Thank you,

Spot

-- Spot (spotweld@juno.com), May 25, 2001.


For welding of Alluminium the most important aspect is that weld time should be very less and the current should be to the tune of 50kamps. Fast followthrough after weld is also important.

I suppose cleaning of the Alluminium sheet prior to welding so as to remove the oxide layer would also improve the quality of weld.

-- Subhash Patwardhan (artech1@vsnl.com), June 16, 2001.



I am having problems with the feasability of aluminium for spot welding 9 off parrallel 1.5mm THK brackets to a 200mm Diameter plate, a total of 18 spots. I have asked for a quote from a local sheet metal worker who replied:

We should be able to make 1off sample but not spot welded. The cost would be be £417-50, we do not have the facilties for spot welding aluminium, but we have had some done by a specialist company. The process is very expensive and we would doubt if this company is capable of doing such a precise work.

Is this true? As a product design student with great faith in developing technology, I am sceptical.

-- Richard Price (richard.price@jarvis-uk.com), August 14, 2002.


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