Laser head is getting hot

Hello,
I have 130W 500x700mm Chinese laser and laser head is getting hot after 10-15 minutes of cutting.I align laser beam on all 3 mirrors and laser beam hitting center of nozzle.I place tape around holeon head (where laser beam hitting mirror 3) and noticed something like reflection back from mirror 3 and reflection is hitting bottom of the hole.Any sugestion how to solve this because then head is hot laser cant cut well.Laser head have Mo mirror inside.
Thanks in advance

laser power output percent set
laser beam path ,
there are air pipe on laser head to blow smoking etc .

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Originally Posted by allencncrouter

laser power output percent set
laser beam path ,
there are air pipe on laser head to blow smoking etc .

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I cut with 65% power,laser beam hit center of mirror on every position and I use air compressor and solenoid valve to blow smoke

I would change the mirrors out if you can’t find where it’s hitting metal. Be careful working around a beam that’s deflecting somewhere.


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