Where ZI retired from we made die cast machines. Our purchasing agent got some linkage for a 600 hundred ton machine from China and was told if they ordered all that was needed for the upcoming year they could get a real good buy on it. The linkage on these machines is where all the pressure is applyed to when closing on a die.
The shipment comes in and looked good until time to machine them. They were full of air pockets that had to be welded shut. So after machining these parts were put on a machine and when machine was finished it was ran for 20 hrs before painting. In run off the linkage failed big time it broke in half. They took a new part off the shelf sawed it in half and there were holes in the center of it that you could put your fist in. China more or less told them they bought as is. They went back to the old supplier to get new ones and was told that the molds had all be sent to China and new ones had to be made because China would not ship the old ones back. And the old supplier raised the price on the new castings. In the end the company ended up with X amount of casting that were junk, cost increase of new castings, plus extra maching time and one less purchasing agent, and out a lot of money. I am sure that this spark plug factory was very clean when compared to one of their casting factories
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