I bought a 60W soldering iron from MR DIY. After about 7 minutes of powering on, the middle part of the iron turned bright red, and a few minutes later, the tip also turned red. Is this normal? I have already exchanged it with the seller, but it's still the same.

why didn't test it at the shop?

nope

It should not turn red. But it happens because they used too thin or low quality steel that caused this problem.

No…..in fact first time I see this…..
TS better be cautious…

For quality soldering iron no, for this type of cheapo soldering iron yes.

Honestly i would recommend get a proper china brand soldering station than using this.
You are going to have a very, very tough time getting any proper soldering done with this cheapo tool.

Either low quality metal or coating.

I have already exchanged one with the seller, but it is still the same.
When I changed to the second one, it looked fine after 6 minutes on site. I took it home and used it for 10 minutes and it turned like this. They said they can't refund the money, only exchange it, but I have already exchanged it once and it is still the same. They don't have any other brands.

Will there be any problems if I continue to use it? Is it dangerous? or does it have to be thrown away? Why would a large, legal company sell unusable products? Doesn't the government care?

MR diy, must be china buat

how about the tip, does it still works before the middle part turns red?

It worked the whole time, it was just that red color that worried me.

Pakai je la.

then the problem is product cheap quality, nothing u can do.

I am presuming you don't have a voltage regulator and you just plug and play. Regular socket wall produce 60w and above. Your cheap solder is running about 35 - 40w range. W/O a regulator it's just going to keep heating until it melts.

Will it really melt? But this product doesn't mention anything about voltage regulator. It says 60W 220~240V, does it really need a voltage regulator?

Oxidization happens much more often with cheap solder .... sooner or later the shape gonna bend. for better quality ones they have separate rod that act as a cooler between the inner and outer rod, the cheap one don't have.

You can still use it, just that its kinda leceh ...... what you need to do is only turn on when you are ready to use and wait a bit. Make sure you have a wet sponge holder and a wet sponge use it to cool and clear the tip, like rub against it after a few solder points. Turn it off after finish use and don't leave it unattended until its safe to do so.

Its like using a manual car, just make sure when its red hot the thing touch nothing .....that is when you have the solder holder to keep it in place.

Idk if there is any master sifu solder expert here, for me I already have regulator that I can adjust and also a safety volt moderator for my pc after thunder fry my com last time ....... I can adjust the voltage so I can just turn it on and use whenever I want. Originally I bought one also from mr.diy and plug directly to socket and notice the heat kept getting higher. Which is why I suggest a regulator.

But of course this are my personal experience so I am by no means an expert in all this. Its best if someone who has been doing this for a while share their experience here so everyone can learn.

yes, the solder iron have problem.

The thermocouple inside should sense the temperature and cutoff when reach the desired temperature.

But your wan keep running till become red. That’s too high temperature. The handle will get hot and the tip will oxidise fast.

Throw it and buy a proper one.

Shopee got

Using voltage regulator is not going to solve the problem here.