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The factors affecting deep penetration laser welding

by:J&D WATER     2020-03-17
Deep penetration laser welding as one of the two basic models of laser welding, Another is heat conduction welding) Its application has become more and more widely. In order to get higher rates of deep penetration laser welding efficiency, this paper summarizes the main influencing factors of the welding mode, including the density of laser power, welding speed, focus position, protective gas, many aspects, such as joint assembly clearance, workpiece material nature, help the users have disadvantages, the most. Extensive use of laser and laser equipment. 1 laser power density deep penetration of welding is the premise of focused laser spot, make its have enough high power density, so the laser power density has a decisive effect on weld. Laser power at the same time control the penetration depth and welding speed. To a certain diameter of laser beam, when increasing the laser power, deepen the depth of molten, welding speed. To achieve a certain welding penetration of laser power generally exist the critical value, reaches the critical value, the molten pool violent boiling, more than the penetration will reduce sharply. In addition, due to the reaction between the metal steam, can form holes in the molten pool, and small hole is deep fusion welding to achieve the key. Focal spot power density is proportional to the laser power not only, also related to the laser beam parameters and focus light path. Two deep penetration welding speed on the welding process, welding speed is inversely proportional to the penetration. In the case of the laser power unchanged, such as increasing welding speed, heat input will drop, penetration will decrease. Therefore, appropriate to reduce the welding speed can increase penetration, but the speed is too low will lead to excessive material melt, the appearance of workpiece burn through. Reason for specific laser power and specific thickness, type of material, have an access to the most. Large penetration of appropriate welding speed range. Deep penetration 3 focus position welding, to maintain the enough power density, the focus position is very important. Focus and workpiece surface relative position changes directly affect the weld width and depth, only focus is located in the appropriate position in the workpiece surface, the weld to form parallel section, and get the most. Large penetration. There are two 4 gas shielded gas protection: 1) Eliminate the air of welding local area protection work surface oxidation; 2) Generated when the inhibition of high power laser welding plasma cloud. 5 workpiece workpiece split joint space, assembly clearance directly with the penetration of welding, weld width. When deep fusion welding, such as joint clearance than spot size, there is no welding; Joint gap is too small, sometimes overlap, the technology will produce board fusion difficulties such as adverse effect; Joint clearance is too large, easy to melt through; Slow welding can make up for some weld defect from the clearance is too large, narrow and high speed welding seam, more strict requirements for assembly. 6 material nature the welding workpieces on the absorption of laser determines the efficiency of the laser welding, the factors influencing material absorption rate of laser has two aspects: 1) Material resistance coefficient, through the absorption measurements found on the surface of the polishing of different materials, the absorptance of laser is material is proportional to the square root of the resistance coefficient, and resistance coefficient varies with the temperature; 2) Material surface state of beam of light absorption rate has the important influence, therefore have obvious effects on welding effect. Laser welding equipment recommendation: preferential deals offer 4007001618 【 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. 【 Automatic laser welding machine 】 Using numerical control software by moving or rotating workpiece computer control of mechanical system, so as to realize automatic welding 【 The laser spot welder 】 Can be used for jewelry, watches and clocks hairspring, integrated circuit lead all kinds of small, precise welding of heat sensitive parts of the YAG laser welding machine 】 High compactness, and strong weld, precise control, high power density, deep and narrow welds, welding seam and beautiful characteristics of laser welding equipment more laser welding laser welding machine
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