breaking point of an Aluminum spotweld on .08 5052-H32 is?

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We are a metal enclosure manufacturer and spot weld a wide range of metals. I was trying to find a chart containing data on what forces a spotwelded product should adhere to. In particular aluminum 5052 H32...we have had a couple of complaints that brackets have been "snapping" off. One example is 0.080 aluminum spotwelded to 0.062 and another would be 0.080 to 0.125. Also is there is a specific method for testing this?

I would appreciate any help you could provide on this.

Regards, Steven Menegotto Engineering Supervisor Hammond Manufacturing Co. Ltd.

-- Steve Menegotto (smenegotto@hammfg.com), December 17, 2002

Answers

Steve,

There are a couple of ways. Perhaps the easiest is peel testing. The minimum button size is generally specifed around 4*sqrt(min stackup gauge in mm). Thus the smallest peel button diameter for the 0.08" to 0.062" stackup is ~5mm while the 0.08" to 0.125" is 5.7mm. Most users like the button size to range above 5*sqrt(t). Another way is tensile shear testing. The minimum strengths should range above 600 lbs for the 0.062" to 0.08" stackup and 850 lbs for the 0.08" to 0.125".

-- D.J. Spinella (dj.spinella@alcoa.com), June 20, 2003.


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