Someone gave me this chair recently, and my paranoid self is now questioning it's design. (not a welder personally)
When I sit my 140 lbs in it, all 4 pins slide out about an additional 1/2", meaning the bulk of the weight on the welds is actually being torqued horizontally, not vertically like you would sort of expect for a chair.
Is this going to metal fatigue eventually ?
I've seen / used this hairpin design many times but it's not usually such a steep angle that the legs splay out like this.

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