Thank you elhombreinnombre. I think that's issue. The pins are all 3-pin which no option for 2 round pin. I was first using the cheap $2 China shop adapter then I used a travel adapter. China shop adapter melted and the travel adapter is two heavy to sit properly in the wall to take the 2 round pin if you understand me. I would be grateful if you could recommend to me an option of a good adapter thermosetting plastic or link with picture example for the best solution to solve so a 2 pin can happily connect to the slanted version with no looseness. I tried not much luck on google.Thank youYour iron should work here. The problem is either the wall socket or the adapter or both. Well, it's definitely the adapter now anyway. It ought to have been made of thermosetting plastic - probably phenolic - and should discolour and smell if it gets over hot. If it's melting then you have no certainty of where the metal bits inside have wandered and you ought to discard it before you start a fire. A lot of wall sockets are provisioned for several standards of plug in the same outlet - common is three-pin splayed combined with two pin round - and because of this it may not be making proper contact with the plug you insert. Poor contact = high resistance = heat. High resistance is what makes your iron work so you've got a kind-of mini iron in your socket.
Using a good quality adaptor - please, not Ali-Express or similar - try plugging into a different socket: one that's used to high loads like your washing machine or tumble dryer. That should tell you if it is the original wall socket that needs replacing
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