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"I thought since the welding is happening on the Wastegate pipe, isn't pressure pushing out towards the wastegate and away from the turbo?"
The crack is NOT happening anywhere in the wastegate pipe...
The crack is happening in the weld that joins the wastegate pipe to the header pipes. Any possible slag or burnt metal crap will fall downwards into the headers and get blown up into the turbo exhaust turbine where it will damage it.
On top of that the wastegate is completely closed until boost pressure opens it so none of the possible slag that may be hanging out in the wastegate pipe will be blown out the wastegate until long after the stuff that fell down into the header pipes has been blown through the expensive inconel alloy turbine wheel.
..maybe you should just try it.
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