Hello, I bought me a second hand Irish flute, because I love the sound of wooden flutes.
But while cleaning it I discovered that the inside of the head is metal. I would like to know if this is normal because I now have the idea that I still not have a wooden flute. Also the sound of it is not what I expected. Can anyone help me?
Hi Afra and welcome to the forums. 
It is very common for wooden flutes to have metal lining to the headjoint. Some would even say that this is normal - it’s what used routinely to be fitted on the nineteenth century English flutes which provide the basic form of the flute most commonly in use in Irish trad music today.
How experienced are you as a fluter? If you are a beginner, it will take you a long time to develop the right embouchure to be able to play these flutes to a decent standard. I believe this is also the case when switching from Boehm system, metal flutes to wooden flutes, though I can’t vouch for that myself, as I’ve never played a metal, Boehm system flute.
Out of interest, what make of flute do you have? Where did you buy it?
Thanks a lot for your reply.
I’m a beginner flutist and take lessons with a Boehm-flute.
I do understand that a lot of practice is needed to get a proper sound from my irish flute.
The flute I bought has an engraved bird on the cover of the case with the letters 1 Q T around it. And I found out it’s pitch isn’t right (Csharp in stead of D, even if I “stretch” the flute entirely).
Sorry for my diction, I’m dutch and not accustomed to use the English language enough.
The Q1T flutes are cheap Pakistani made things of mediocre (though not the worst) quality. If you use the forum search tool you will find at least one old thread about one and a demo video I made. Based on my experience, I’d expect one of those to be a usable but not really good quality instrument.
C sharp is lower than D. “Stretching” the tuning slide would make the pitch lower. So if it is playing too low, pushing the tuning slide in and shortening the length would make it play higher.
Here’s that old thread:
https://forums.chiffandfipple.com/t/identify-an-irish-flute/88592/23