"Operator protective equipment including welding gloves, welding shield and 1070 nm laser-safe glasses are required"
Does not specify what (log scale) attenuation the glasses must provide.
"Danger
Invisible laser radiation
class 4 laser product
class 4 invisible laser radiation
when open
avoid eye or skin exposure to
direct or scattered radiation"
"Max average output power 2500W
Peak peak output power 5000W
Pulse duration >= 50 us
pulse repetition rate 0 - 10 kHz
Wavelength range 900 - 1200 nm"
"Part contact electrical interlock turns off the laser power if the welding head is not in contact with the welded parts"
Ah, that's the trick. Laser is supposed to be contained by tip contacting workpiece?
Several tips available, some look quite open. Reflected light from molten surface seems likely.
"Class 2M laser product
Max. Average Power 1 mW
Wavelength range 600 - 700 nm"
1mW? That's a laser pointer.
class 2M? Eye protection is provide by the blink reflex.
That is apparently a visible laser pointer so you can see where the welding laser will be applied.
Compare to:
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acceleroninc.com
"Like electron beam welding (EBW), laser beam welding has high power density (on the order of 1MW/cm2) resulting in small heat affected zones and high heating and cooling rates. The spot size of the laser can vary between 0.2 mm and 13mm, though only smaller sizes are used for welding."
What a difference capitalization makes!
en.wikipedia.org
"A Class 2M laser is safe because of the blink reflex if not viewed through optical instruments. As with class 1M, this applies to laser beams with a large diameter or large divergence, for which the amount of light passing through the pupil cannot exceed the limits for class 2."