Yes, much like with conventional welding techniques, a welding helmet is necessary while using a laser. Lasers emit powerful light that can cause damage to the skin and eyes, therefore wearing protective gear is essential.
Safe and efficient welding can be accomplished by wearing a welding helmet with a shade level suitable for the kind of laser being utilized.
When using lasers, safety should always come first, and wearing the appropriate protective gear is an essential part of that. When used properly, laser welding may be a very fruitful and satisfying operation.