If you are not using any filler material that first spot with some slight spatter should be your keyhole. This is the first point of beam absorbtion and what drives your weld pool. Can you give us some other details on the application (laser,type of weld joint,parent material)?
If your mode looks good from the head of the laser, it may be your 90 deg phase shift mirror. Typically this is the last mirror before the beam hits the lens. Also make sure you have a fairly decent (clean/new) lens.
Since you listed that the parts were welding into the sheet, I would guess...
The "BLACK MAGIC LENS" do last a little longer when aluminum or stainless deposits build up on the due to splatter. The coating also helps reduce reflections back up into the system. Having said that, in my experince they do not greatly improve the cut quality or speed. Also they do not transmit...
The only decent way to etch aluminum with a CO2 laser is to have the aluminum anodized or use the "Etching Aluminum" made for laser engraving. This is the stuff the trophy and plaque places use. It usually has a thin layer of aluminum on top then another thin subtrate under that shows up as...
At my former job we cut 12ga aluminized carbon steel for customers, and it would have the same edge quality as mild steel (burr free, and oxidized). Since it is just a coating (you said aluminized right?) that is not very thick it can be cut burr free with oxygen. It may be your cut conditions...
Have you tried pulse cutting the section that is giving you trouble? How thick is the tube, what angle is the bevel, is it mild steel, is it round or square??? I would need somemore details?
Chad
In regard to any suggestions, I would need more details.
For instance, is the angle of incidence for the angled joints the same for the straight joints? Is there any post clean up on the edges of the parts? Are all mating edges flat and relatively smooth? Is there any gap between the mating...
Rofin-Sinar produces top of the line CO2 lasers. They are constantly pushing the envelope of technology with lasers. They are the "big name" in industrial laser technology. Our shop has worked with their laser units for years,with relativly few problems. If there are problems,they...
lasermen,
If this is for mild steel give this a try, use between 15 and 125 Hz for your frequency (start at 125 Hz and work your way down), use between 25 and 15 for your duty cycle. Set your gas (O2) at about 900 mbar; start your feed rate at 2000 mm/min and use between 12 to 20% power. If...
Gary,
We use Precitec's M1.5 DXN style heads at our shop, and we are also looking to upgrade to a HP 2" M (Z). More people tend to be moving towards the cartridge style lens holders for convenience. With any upgrade or retro-fit you will probably be the most concerned with how well...
The problem I'm describing comes from coupled motion (simultaneous X and Y motion) usually at high speeds and during block changes. After a corner or block change there is a tendency for the cut edge to have a small wiggle in it. It is usually only noticeable at higher speeds. In gantry machines...
I am guessing you use a gantry style machine equipped with AC servo drives? It seems most servo drives have this flaw. At high velocity the PWM signal seems to bounce. Kind of like backlash, this is not good for high speed cutting. I've heard of using edge conditions in newer machines, also...
Try this, use a large orifice nozzle(2.5 to 3 mm) and a 7.5 focal lens. Take the focus 2 to 3 mm below the nozzle. To get rid of the PVC coating run your parts with the laser head anywhere from 4 to 7 inches above the sheet. Use lower power (500 to 1000 watts) and higher pressure (200 psi...
Hi, RoyMultishape
Yes there is a limit to achievable speed when cutting with oxygen due to the balancing of the exothermic reaction. For cutting thin mild steel at high speeds, high pressure Nitrogen is your best bet. And using lower grade nitrogen will usually cause your cut edge to exhibit a...
