how laser beam is useful in welding and machining process and there applications ,advantages,disavantages.....

Answer 1

Laser welding is especially suitable for very small and thin parts where the joints require no filler materials. The beam heats the edges which melt together within an oxidation-protective bath of typically Argon gas. Cutting, engraving, and machining are also done using laser.

The advantage are the extremely high beam focus precision, and the very high temperature that melts tungsten carbine easily and can even engrave diamond.

The disadvantages are capital equipment and operating costs (expensive Argon and CO2 gases), floor space to house the machine, and the fact that it is a hot process (unlike, e.g., a cold resistance welding).

Answer 2

Lasers can be very helpful in machining parts. Being a machinist myself I could tell you that they are very helpful. Lasers could be used to cut, weld, and scribe information on parts. Those are some of the good points to laser use in machining. Also laser welding, cutting, etc. is usually only good in mass production.

However most lasers that are used for cutting, scribing are not as exact. I routinely have to machine parts that have tenths of thousandths of an inch (.0001") precision and this cannot be done with todays laser cutting technology. The best way to do this is using a regular cutting tool depending on the situation or EDM (electro-discharge machining) machine.