Characteristics of laser welding process principle
A laser welding, laser welding principle to the continuous or pulse laser beam can be used to implement, the principle of laser welding can be divided into heat conduction type deep penetration welding and laser welding.
Power density is less than 104 ~ 105 w/cm2 for heat conduction welding, the molten depth, welding speed is slow;
Power density is greater than 105 ~ 107 w/cm2, the metal surface is heated under the action of sunken into the cavity, the formation of deep penetration, welding speed, the characteristics of the deep wide than big.
Of heat transfer principle of laser welding, laser radiation heating for processing surface, surface heat to the internal diffusion through heat conduction, by controlling the laser pulse width, energy, peak power and repeating frequency of laser parameters, such as melting of components, to form specific molten pool.
Used in gear metallurgical thin plate welding with welding and laser welding machine is mainly involved in deep penetration laser welding.
Deep penetration laser welding are usually performed by continuous laser beam connection material, its metallurgical physical process and the electron beam welding, the energy transformation mechanism is through the 'hole' (
To complete the structure.
Under a high enough power density laser irradiation, material produce evaporation and the formation of small holes through them.
The hole is like a black body full of steam and absorbs almost all the incident beam energy, balance hole cavity temperature around 2500 0 c, hole cavity outer wall transfer heat from the high temperature, surrounded by this hole the metal melt around the cavity.
Holes with continuous evaporation of wall body material in a beam produced by high temperature steam, around the holes 4 walls surrounded by molten metal, liquid metal surrounded by solid materials (
In most conventional welding process and welding, the laser transmission energy first deposit on the surface, and then by passing to the internal)
Hole wall outside the liquid flow and wall surface tension and repelling hole cavity pressure of the steam produced continuously and keep the dynamic balance.
Outside the beam continuously into the hole, the holes in a continuous flow of materials, with mobile light beam, the small hole is always in a state of flow stability.
That is to say, the wall and around the hole the molten metal as the leading light speed forward, left after you remove the molten metal filling the hole and then condensing the gap, so weld formation.
The process of all this is happening so fast, make the welding speed is easy to reach several meters per minute.
Second, the characteristics of laser welding,
High energy density, suitable for high speed welding.
Welding time is short, the thermal deformation of material itself and the heat affected zone is small, especially for high melting point, high hardness and processing.
Electrodeless, tools such as consumption of wear and tear.
No pollution to the environment.
Can be achieved by fiber distance, to meet part of the ordinary method, multi-channel simultaneously or welding.
It is easy to change the laser output focal length and position of solder joint.
It is easy to carry on a robotic device.
Composite laser welding technology has significant advantages.
For composite laser welding, the advantage is mainly manifested in: no seam on the back of the sagging during burning through phenomenon, the applicable scope is more extensive;
For the laser -
MIG welding, the advantage is mainly manifested in: high welding speed, welding depth is big, less welding heat, welding of high strength, small weld width and weld projection, thus making the production process of the whole system stability is good, good availability of equipment and weld preparation work and weld after welding processing, small amount of work of welding production time is short, low cost, high production efficiency.
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Metal laser welding equipment 】
Suitable for all kinds of complex welding, the welding of different equipment and 1 mm thick seam welding;
Multi-channel fiber optic mode, welding transfer at the same time;
Mould laser welding equipment 】
Applicable mould industrialized, used for precision mold repair, such as digital products, mobile phones, toys, automobile, motorcycle, mold and other mold manufacturing and molding industry.
Gold and silver jewelry laser welding 】
Mainly used in jewelry, such as electronics, communications, handicrafts and other industries;
Large laser welding 】
Application in automobile body covering parts of compound, such as car door, side wai, window, floor, warehouse, the warehouse before, trunk lid.
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