Hi,

  I have a small dual pulse spot welder I use for proto battery backs. I
know from experience that pressure and electrode shape make a big
difference.

 In one photo the welds seem rather large, I wonder if the pressure was
being maintained. If you loose pressure magnetic forces will open the joint
and you get an arc. The arc can make quite a mess as it dumps more energy at
the locations.

 My "Test" is that pulling a nickel strip after welding should result in the
weld spots being torn out of the strip. IE the weld is stronger than the
material.

Bob Kondner


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of stephengregory5849
Sent: Wednesday, August 26, 2009 9:07 AM
To: [log in to unmask]
Subject: Re: [TN] Spot weld photos

Morning Victor,

Got your pictures. Here they are:

http://stevezeva.homestead.com/files/Batt-1.JPG

http://stevezeva.homestead.com/files/Batt-Orange-1.jpg

While I'm no expert on spot welds, I'm pretty sure you won't see any sort of

"reflowed" appearance with a spot weld. You'll just see a mark or 
indentation of where the electrodes contact the metal. Have these battery 
terminals been falling off the batteries?

Steve

----- Original Message ----- 
From: "Victor Hernandez" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Wednesday, August 26, 2009 8:19 AM
Subject: [TN] Spot weld photos


Steve,

Can you please post these photos on your home page.   Many thanks,


Vic,

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