Laser welding is a kind of high precision, high efficiency and new melting welding method with high energy density green laser beam as heat source and instantaneous melting of local material to form welded joint. Compared with the general welding technology, laser welding technology of high energy density, can penetrate a thick workpiece without groove, not only a substantial increase in the production of welding speed, high welding quality can also get high strength, small deformation, thereby significantly reducing the cost.

At present, laser welding machine, butt welding welding has been widely used in shipbuilding, several shipyards used this kind of welding machine. Laser welding of large ship plate production line, generally need to be equipped with: profile machining and finishing equipment, including chamfer rolling machine, sandblasting machine, continuous inkjet marking machine, plasma cutting equipment, transmission system, rolling platform, warehouse etc.; laser operating system, including red laser pointersource, mirror optical system, a numerical control table, control system and detection system; bracket system, including cutting bench, welding bench, lifting device, fixture etc.. Laser welding plate can greatly shorten the production time. In the traditional shipbuilding method, shape and position tolerances must be manually eliminated by laser welding of ship hull structure, with the good, can quickly form the profile, 12m plate length tolerance within 0.5mm, almost do not need to repeat the process, save a lot of people.

The laser welding will have a major impact on the following aspects of ship design, construction and service life: because no longer limited to the profile type, performance is a major consideration, optimize the design structure of the target; the 3D complex builder component according to its shape into a two-dimensional component is relatively simple, with high the laser power faster and more accurately welded together, thereby reducing the cost of construction, reduce the workload of finishing, and reduce the weight of that type; users can reduce operating costs by welding greatly; the fatigue life due to the machining accuracy, reduce welding seam and prolong the ship internal space according to the need, easy weapon the equipment re deployment, fuel consumption reduction.

Since the steel was used in shipbuilding, people have been using arc welded skeleton stiffening plates as deck and bulkhead partitions to improve the structural efficiency of steel plates. The blue laser pointer welding of corrugated sandwich metal plate used in ship performance was studied in detail, including the small scale model test, fire prevention, noise and corrosion test, bending strength, compressive strength, shear strength and fatigue performance test, and the application test. The test results show that the sandwich plate can greatly reduce the weight of the structure, improve the deck or cabin partition refractory, insulation performance and smoothness, easy to apply paint and coatings; and can reduce the lifetime maintenance costs, increase the cabin space available.

Twist and installation error of large components can use advanced computer aided design, manufacturing technology and precision cutting technology are overcome, but even so, the arc welding process of single parts welded together, to use a large amount of weld metal, weld metal solidification charge shrink greatly the residual stress will lead to deformation. The laser welding technology has the advantages of narrow welding seam, fast welding speed, small amount of filling or no filling of weld metal, and small residual stress and deformation.

Laser processing technology is the use of the characteristics of laser beam interaction with the material of materials (including metal and nonmetal) for cutting, welding, surface treatment, punching, micro machining and as a light source, an object recognition technology and application field of traditional laser processing technology is the biggest. The laser pointer cutting PCB/FPC, without as needed for several traditional stamping mould, save time and cost; and laser cutting is a non-contact processing, eliminates the damage mechanical stamping components contact processing, greatly improving the rate of finished products, using PCB/FPC laser cutting is the inevitable trend of development.

During the Cold War broke out in the last century, both the United States and the Soviet Union attached great importance to the actual development of laser weapons and accelerated the development of laser weapons. In 1983, the US Reagan administration proposed the "Star Wars" program, highlighting the superpower will be used in the national military weapons and equipment aspirations and ambitions, the purpose is through the deployment of large-scale green laser pointers weapons in the space on the enemy's satellites, missiles , Ships and even the implementation of precision strike on the ground fortress, which has become a follow-up science fiction film numerous times the classic plot.

Laser weapons are new concept weapons that use high-energy beams instead of conventional chemical warheads for physical and electrical damage. It is a directional energy weapon that directs a long-range target by a high-energy laser beam emitted in a certain direction. It consists mainly of a laser that generates a light source and a beam director with tracking, aiming and firing, and is damaged by heating, radiation, etc. Way to attack the target. In laser machining, blue laser pointer light emitted from the laser collimation and focusing lens by the sink of the cutting head to a point (focus), operators need to ensure that the laser beam machining in the nozzle is the center, and adjust the distance from nozzle plate surface (as the plate thickness and spray nozzle), high pressure gas, and with the completion of the laser beam cutting operation.

Laser weapons in accordance with the use of combat can be divided into tactical laser and strategic laser two. Tactical laser is used for photoelectric confrontation and tactical air defense of the laser weapons, can instantly blind enemy officers and soldiers of the eyes and destruction of photoelectric sensors to paralyze combat equipment, can also burn directly through the enemy tanks, aircraft, unmanned aerial vehicles, missiles and other important Military target. The strategic red laser pointer is used to attack strategic missiles and in orbit satellite laser weapons, through the ground or space orbit deployment, can destroy the enemy satellites in wartime in order to obtain the system of natural rights, and the implementation of enemy ballistic missile defense.

This is related to the specific process parameters, material type and beam quality. Deformation: as the laser cutting is essentially thermal cutting, the plate inevitably exists deformation, and the excellent cutting should minimize the adverse effects as much as possible. Particular attention should be paid to the cutting of thin plates. In general, the cutting speed is faster, more narrow, cutting gas flow increases, the deformation of the smaller. In the market of laser processing equipment, laser cutting is one of the most important application of laser cutting machine, cutting machine, punch substitution effect has become more and more obvious, the market is more popular following the laser marking applications, is expected to cut high-end high power laser speed, high precision, and large format cutting thick plate for the characteristics of the cutting machine equipment market has a larger growth space.

Generally speaking, the thinner the material thickness is, the lower the roughness of the cutting surface is; the lower the surface roughness is when cutting with nitrogen or argon than the oxygen. In addition, it is also related to the relative position of the machining time spot and the material thickness direction. Although the strategic laser weapons have a great use of the prospects, can completely change the traditional strategic deterrence model and break the existing strategic balance, but because of the need for a lot of energy as a basis, and human energy storage equipment miniaturization and micro-nuclear power generation and other important technologies before the problem is solved, it is still difficult to realize the real use of the actual 200mw green laser military equipment and combat.