Ooo this thread isn't too active...

Anyways I'm having problems with my soldering iron(s). I'm actually not sure if its a problem with the iron or the tip piece. I found that when I put on the new tip it will sort of 'burn' out or oxidise and can't take on solder. I've been looking at a bunch of soldering iron care guides/videos and how you should tin the tip.

I try to tin the tips as soon as the iron can melt solder however the tip still burns out. I don't think its the soldering iron temperature because the temperature is only around 400deg. Is this due to low quality tips?

Yeah I frequently clean the tip with damp sponge, but even so, halfway soldering the tip seems to just stops taking solder and cannot be tinned anymore.

Then I have to change the tip. And it happens again...