The use of welding materials given to the general requirements to achieve high strength
Compared with traditional welding methods, laser welding with high energy density type, workpiece heat-affected zone is small, easy to implement automatic control, etc., in industrial production has a wide range of applications. On the laser welding, people do not tend to think of a few kilowatts to add fillers or even tens of kilowatts output power carbon dioxide laser welding, or with a few kilowatts of output power YAG laser welding. There is no doubt that without the high-power laser welding filler to the manufacturing industry has brought a leap of progress to solve the structure of high precision parts of the welding problems. However, for some lower precision, required penetration depth thick, the structure does not allow parts by high fever and poor weldability of materials, laser welding without filler has not applied, it will produce the quality of welding defects (such as emergence holes, dents, structural deformation or can not weld, etc), causing the entire part or parts obsolescence, which makes the application of laser welding manufacturing techniques are subject to many restrictions.
The study of laser welding filler wire to resolve the laser welding without filler wire limitations in the application provides an effective solution. However, commonly referred to as laser welding filler wire multi-finger power or ultra-high-power laser welding filler wire, type of Welding Electrode mainly for large or thick parts, and a lot of research and literature have been reported.
And is not permitted for the heat, easy deformation thin-walled structures, micro-structure and complex-shaped structures are less filler wire welding of such parts as butt weld gap width uncertainty, with parts shaped butt gap processing conditions and the quality of random changes in the assembly, and therefore can not automatically control the welding pieces of the operation, the filler wire can not control the direction and speed of filling. The main subject of study, less power to do small parts pulsed YAG laser welding filler wire for welding process parameters and weld heat affected zone of influence.
Laser welding filler is pre-populated in the weld after welding material specific, with the laser melting or laser welding, while fill material to form a welded joint approach.
Welding, Tungsten Electrode using special fixtures will be fixed in the gas specimen area, manually trigger the laser and manual welding wire way. Due to the smaller specimen, the laser welding filler wire after the test pieces were welded at the molten filler often have more accumulation, so the location needs to be polished finishing welding, welded parts and the surrounding tissue to form a smooth transition.
In the welding test, only the laser output power less than 40W, and a shorter duration of action, the filler wire and the specimen matrix heat more evenly, thus avoiding excessive deformation temperature of the sample, but also to avoid the vaporization of filler wire and evaporation. The destructive tests proved that the weld strength to meet the requirements.
Fronius company in 2009, and two laser Welding Electrode welding, cutting equipment market. The equipment used in gas laser welding technology combines laser welding and gas welding two kinds of welding technology advantages. Diversity and its application-specific benefits from the laser and arc welding nozzle were living in an automatic welding head, the same laser beam welding and gas welding of two arc welding parts together in the pool.
The first laser welding and gas welding together of the welding test can be traced back to the 1980s. But 20 years, this technology has been hovering in the laboratory, the laboratory has not taken the door. In the hybrid welding process technology, the laser beam and arc welding arc while welding pieces of acting on the welds. High energy laser beam to melt the solder pieces deep inside; MSG welding gas arc welding system is given, while in the continuous transmission welding, forming a wide flat surface of the weld. This compound combines laser welding welding technology advantages (high-speed welding, heat affected zone is small, the weld depth) with the advantages of gas welding (weld good connectivity, high weld strength and can be the use of welding, weld quality have improved the ability of the destination).
Application of the laser gas welding experience, users want to laser gas welding equipment and more powerful, the focus is to address the thick steel plate welding, better and faster way of melting the welding speed. According to Fronius's technical staff to use process analysis and evaluation, that the laser welding together two composite welding electrode is the best solution. In this scenario, the main problem is: the laser nozzle and two gas welding nozzle as small as possible in a single automated welding head, the laser beam and arc welding should be as small as possible distance between (Figure 1). In addition to factors of Copper Welding Electrode technology, welding head size and movement performance, close to the performance are needed to solve technical problems.