Another precaution it to put your welder's ground cable as close to your repair site as is reasonably possible and think about where the welding current will flow for example, if you're welding on a door, connect your ground wire to the door so that the current doesn't have to flow through the door hinges.
If its getting MIG or gas welded, dont worry about it. If the welder is using a TIG with a high frequency box, you may want to pull the comp and the radio. or alteast make sure they have no power to them. A guy I know that works on TEC2 alot had a customer that nuked something(forget what it was) when he had someone TIG on the car with the ECU still hooked up.
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