"blow in" defect in CO2 laser beam welding / burning candle in the jar
"blow in" defect in CO2 laser beam welding / burning candle in the jar
(OP)
I'm trying to find the causes of the phenomenon called "blow in"
for those who don't have an idea of this phenomenon in welding application it's quite like the burning candle in a jar experiment :
put a burning candle on water then cover it with a glass the candle will stop burning and the water level in the glass will increase over 20% of the glass volume
it's the same with laser welding : when you try to weld a close chamber at the end of the weld when you stop the laser beam, you see the melt bath being soaked up inside the chamber this is "blow in"
I am trying to find the physics parameters behind thís sh... eeeerr this problem
Is there anybody who have a clue on this subject?????
thank you for answering
PS:
and thanks for having read my awful english
for those who don't have an idea of this phenomenon in welding application it's quite like the burning candle in a jar experiment :
put a burning candle on water then cover it with a glass the candle will stop burning and the water level in the glass will increase over 20% of the glass volume
it's the same with laser welding : when you try to weld a close chamber at the end of the weld when you stop the laser beam, you see the melt bath being soaked up inside the chamber this is "blow in"
I am trying to find the physics parameters behind thís sh... eeeerr this problem
Is there anybody who have a clue on this subject?????
thank you for answering
PS:
and thanks for having read my awful english





RE: "blow in" defect in CO2 laser beam welding / burning candle in the jar
RE: "blow in" defect in CO2 laser beam welding / burning candle in the jar
the pressure is of course the parameter the most important in fact the problem is how to provide the "blow in" or to regulate the pressure without drilling holes in the close chamber
RE: "blow in" defect in CO2 laser beam welding / burning candle in the jar
ncik
RE: "blow in" defect in CO2 laser beam welding / burning candle in the jar
RE: "blow in" defect in CO2 laser beam welding / burning candle in the jar
can you describe your chamber. material - weld configuration, penetration, laser parameters. did you try to cool the chamber? or tried to provide cooling closer to the weld joint.
Sarin
Scientist,
Centre for Laser Processing of Materials.
RE: "blow in" defect in CO2 laser beam welding / burning candle in the jar
in one side it's close by a "tulip"
on the other side it's close by a "stud"
it's a CO2 deep penetration welding
laser power: 6kW
frequency : 50kHz
feed rate : 2 m/min
the gas I combine with is He
the material is pre-heated
the problem has also to deal with the production setting limitation
so cooling/provide cooling yes I think it would work but I also have to deal with cost efficiency problem
I think the problem is not so simple to explain
I'll really need someone who was already in front of this problem
thanks to everybody for the answer