What prameters should be used to get proper welding? now we are using squeeze time, weld time, % of current and hold time how these parameters can be used to get a good and strong weld? please send regarding this subject thank u

-- rashmi (radha@xmail.net), February 04, 2002

Answers

04/02/2002

To avoid the marks you require a setting where in you can give a very short burst of very high current.This way the heating is very localized.But you also require a welder with a very fast followthrough action to compliment the fast short burst of current in a short time.

To tell you what parameters you should set, information like sheet thicknesses to be welded, machine capacity etc would be required.

Let me know if you require any further information.

Thanks and regards,

for Artech Engineering, Pune,

Subhash Patwardhan

-- Subhash Patwardhan (artech1@vsnl.com), February 04, 2002.

Dear Rashmi,

Please refer my response to one of your earlier enquiry regarding seting of parameters.

In order to minimise oxidation marks, one has to properly set the parameters. 1.Here therefore important would be the type of Controller being used ( means more precise controlling of the Welding cycles )

2. Secondly, the Job preparation is very vital. No grease or oil deposits on the Job to be welded.

3. Also note that Aluminium has faster formation of oxidation than M.S or CRCA.

Any more requirement, please let me know.

Ranjit

-- Ranjit (ronjitsinha@rediffmail.com), April 01, 2002.

I often see a small black dot in the welding of mild steel. This type of oxidation mark simply shows too much heat was used. Expulsion from the interface probably accompanies this. If you are turning heat down, be sure to peel test some welds at 10% less heat than you intend to use, to make sure your setting doesn't cause cold welds. If it does, you may have to add heat cycles.

I like to qualify a setting with the three parameters (PTH)"hotter" by 10%, then "colder" by 10%. If these settings don't (both) produce acceptable results, you won't be able to tolerate normal production variables. To be more specific, lets say you feel 600#, 10 cycles at 10,000 Amps is a good setting. try 540#, 11 cycles at 11,000 Amps, then try 660#, 9 cycles at 9,000 Amps, if both are acceptable, then your original choice was good. If only one was acceptable, use that one as the "center" and try the "10% both ways" test again.

-- David Bacon (dbacon@updatetechnology.com), April 18, 2002.