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Old 06-28-2004, 05:00 PM
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Welding frame, how to protect computer?

I need to do some welding on my car frame near the rear bumper. What if anything do I need to do to protect the car computer? I'm using an electric arc welder. Thanks

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Old 06-28-2004, 08:17 PM
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If you really want to be safe, completely disconnect the computer from it's harness. Some will say that you cannot hurt it, but I have heard some horror stories.

Vince
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Old 06-29-2004, 08:42 AM
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Thanks!
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Old 06-29-2004, 03:18 PM
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Computer

[color=lightblue]Doc here:


You Can in Fact damage the Computer by leaving it in the Car while Welding. Unplug and Remove it.

The reason for this is the Frequency of the Welder Destroys Static Charged Chips inside it. Does not require Direct Connection To the Computer at all. The Static Running back through the Grounds and up the wires will do a very good job of turning your Computer into a $300 flower pot.

The Computers are well buffered against this, and are rugged, but a Welder is a formidable blast on MOS / CMOS technology.

I Would also beware of any High End Audio / Video Equipment Inside the Car too... Same technology applies...

Depending on the age, and Technology of the equipment involved, Microprocessor's, Ram and the ROM
(or Instruction Cycles for the Microprocessor, Chipset)

Are usually Static (MOS / Cmos /Hmos) .. or Electronic
(Or way older versions) Light / Electronic Programmable.

They Can Lose the program with a Static blast and the Microprocessor and Chipset Has no instruction set to tell it how to run.

These were actually Designed to do this under Controlled Circumstances and are Called PROM's, EPROM's, EEPORM's, EARPROM's or Programmable Read Only Memory...The Instruction Set can be "Burned" in to the prom to make the Computer do what you want it to do per Cycle. I.E. "On Each cycle Check and Compare, Oxy Sensor, TPS, EGR, Tempeture... Run Cycle again"

These usually have a pin on the Chip that a voltage is applied to "Open " the memory Bubbles inside the Chip, Each Data Bit of Instruction is "Attached" to a Bubble and assigned an address, Then the Voltage at the programming pin is removed or tied low (Ground) and the "Bubbles" retain the Data Bits and are Closed. These Chips are Static in Nature. Handling the Chips with just the Static from your Hair, or Clothes can burn them out, actually Burn holes in the planar inside the chip...So you can see what a welder might do to one..

Doc
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Old 07-06-2004, 12:51 PM
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Wow, I'm glad I asked before I went ahead and started welding. Thanks for the information.
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