Also you might show pictures of the "weld screws"
Are you saying you recently bought it you said "The s4 + Bitmain buy direct , but I get hit all the bases and holding up cards because loose bolts were broken". If those needed welded it would take one heck of a hit.
I'm confused if it's something you have had or a new miner to you?
These s4 + I buy direct from Bitmain is more , I give eight coupons of S7 in this forum here .
The fault was the safest shipping company .
I did not think they sold these in a while on main site. If you truly just got from bitmain I would contact them for warranty. But I'm guessing you have had them and there is a miss communication.
I think there might be a language barrier. Are you saying you just received this miner from bitmain? Or saying you have been running it a while?