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filiming techniques for electric arc welding- HELP!!!
Hi all you experts out there!
I work for an vocational education institute.
We are producing a DVD resource containing footage of electric arc welding.
We are having some trouble capturing the arc and molten pool of the weld in clear detail.
We are shooting in DV using a Sony DSR-22AP.
Camera settings we have used so far(with good to ordinary results) are:
Full manual, shutterspeed of 1000, gain of 0, and iris nearly fully closed.
We are also using 2 soft lights.
We have tried using a ND filter of 8, with no real success.
Does anyone know of any settings / techiniques that may produce better results???
Thanks in advance for any assistance anyone can offer!
Cheers,
Jody. -
4 Replies
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OOPS!!
Sorry the camera is a Sony DSR-200 AP
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One problem is the light intensity range, another is the ammount of UV generated, I would make a filter using welding filter glass, the shade depending on the current, you might try shooting in segments, first with a dead stick and no filters to show setup position, then use a couple of flood lamps and the filter to show the strike and pulling the arc, running the bead and puddle. Using the welding filter will remove any UV problems from overloading the CCD, I would also use manual settings on the iris control and change as necessary, you can try a lower number filter if too dark, conversely a higher number if too bright and out of the cams ND and iris adjustment, using a gold coated filter may help.
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Try a polarizer filter to block out light coming at certain angles. Might even be able to stack them and get a clearer view at your welds.
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Thanks alot for your advice guys, much appreciated!
Have just completed more tests with an automatic welding shield – it adjusts the shield’s filter as soon as the arc is struck.
We mounted the shield over the cam’s lense and got a really good clear result, considering the limitations of the camera.Cheers,
Jody.
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