The influencing factor of quality of solder of analytic laser drill rod reachs blemish cause of formation

Solder the influence focusing of plank material has very small one part to be soldered only in the laser energy on workpiece plank stuff place is absorbed, was dropped by reflection for the most part. If the relation between the absorptivity of laser wavelengh and different board material pursues 2 (the graph line that gives out is to those who get is in below room temperature) . The absorptivity of the laser wave that solid laser generates is about to steely material 35% , it is to cupreous material 4% . This explained why must want to undertake warm-up with electric current to steely material. As temperature elevatory, absorptivity also rises subsequently. Graph the stuff below 2 room temperature is right the absorptivity of different wavelengh laser 2.

Strong role is in the resistor that formed to be passed by voltaic loop in the transition of welding wire and component, heat the quantity of heat of welding wire arises by this resistor namely. Be burned by laser in welding wire must want to connect with the component before frit touch, so welding wire has been touched to the front of laser focus in motion on add workpiece. Be in this locally the energy of laser still can't fuse welding wire, next welding wire by carry focal part down drill rod welding line, be fused over. Can make sure welding wire and focal center maintain a contact all the time from this. Be pressed to bend to let welding wire, must want to let all welding line positions hold a large strong part, the strong role that is more than 40 ° already was confirmed to be reliable. 3.

If electric current of warm-up of drill rod welding wire appears in process of treatment of solder of laser drill rod splatter the phenomenon of content, that added thermocurrent to had arrived with respect to the specification top upper limit, welding wire fuses too early. If the quality of welding line compares difference, that adds thermocurrent to be in floor level limits with respect to the specification, that is to say welding line surface is rougher and rougher. In principle should use big electricity as far as possible in machining a process. 4.

Energy of focusing focus laser must be centered to treatment dot through focusing, stimulated light energy to be absorbed by drill rod welding wire partly from this, one part is added workpiece was absorbed. Practice experience makes clear, the of about 50% energy in the focus is used at heating circumjacent area. In addition, consider the largest treatment gap measure even, the diameter when the focus too hour, welding line shows small red, the surface is very inhomogenous, have splatter strongly the tendency, and adding workpiece the reverse side see those who be less than welding line have head mark. Too much laser energy was in by concentration on welding wire, because this makes,solder becomes overheat. And the side that adds workpiece at the same time did not get heating enoughly however, such solder shed treatment not easily go in aperture. 5.

Solder speed removes above factor beyond, process of treatment of solder of laser drill rod still is soldered the influence of the floating rate of lens group and speed of welding wire feed. So must the welding line area that solder quantity asks by place and need treatment welding line length will decide, the supply capacity of solder unit time is decided by the cut area of the feed speed of welding wire and welding wire. These ginseng are numeric must with solder the floating rate of lens group is harmonious and consistent, such ability make sure necessary solder is measured. In be used actually, for example solder of POLO roof drill rod, solder relatively for the floating rate of lens group, speed of welding wire feed is obtained a bit taller more the requirement that accords with us. Because can arise so a few solder is superfluous, as a result of,reduced welding wire speed inhomogenous and those who cause pore is dangerous, and the area of welding line cut that also assured that he must want to achieve. Because the laser energy of solder of laser drill rod accepts restriction, solder so the floating rate of lens group accepts restriction as much. In speed higher case falls, moving deviation also meets the robot of relatively academic contrail greaten because of this; The rate that run is rapidder, the susceptibility that treatment process disturbs to the outside is bigger also. 6.

Other because be mixed with the diameter of welding wire,the width photograph of juncture is compared, central issue of drill rod solder is relatively minor, equipment is so medium the precision of each component count for much. Specific for, the repetition that includes clamp orgnaization among them the guiding of precision, robot the tolerancepublic errand size of the precision that installation of the component on precision, robot nods and each component, these should be in the category of the consideration. Type of blemish of solder of laser drill rod reachs the complexity that forms a reason to machine a process as a result of solder of laser drill rod and numerous influencing factor, when occurrence treatment quality drops when the phenomenon, cannot explain below most circumstance with a reason, but the beginning that machines orbit and ending paragraph be considered as most crucial part normally. To the requirement of quality respect is satisfied when solder of use laser drill rod, every link that must have adjustment to machining a process undertakes carefully operating. 1.

By volume of weld defects section classification is in actual production, blemish affects section volume to be able to divide into different sort: (1) durative blemish: Solder of whole laser drill rod machines its consist in in the process. To this, not be to say paragraphs whole welding line has drawback, however blemish reappears again with unbeknown rule welding line is medium now. (2) local defect: Local defect reappears again same now a welding line position, its incidence is finite. (3) easy happening the area of the problem: The certain area of welding line, still have the oblique plane area on plank likewise like welding line begin and welding line ending, it is the area of special and easy occurrence problem. 2.

Press blemish surface classification of characteristics (1) small air hole: Be less than when stomatic diameter 0.

When 2mm, it is small air hole. (2) stomatic: Normal stoma (bigger than small air hole) the diameter is the biggest do not exceed 1.

0mm. (3) empty / welding line interrupts: If stomatic diameter is more than 1.

0mm, be called empty. (4) fusion welding welding line: Solder is done not have in welding line, the appearance of welding line resembles is welding line of laser fusion welding. (5) inferior solder join: Drill rod welding wire did not rise in the flank connection that increases workpiece. Be in office of position of welding line connective, welding line looks " come loose one continuously ground " . (6) the bosseyed join of solder: Solder joined with a flank only rise. (7) banger phenomenon: Add workpiece to rise without join, in solder of welding line place straightforward ground extend piles up. (8) welding line is irregular: Welding line cave in or raised. (9) scale shape piles up: Welding line surface is not slick, appear very coarse. (10) welding line begin / welding line is terminal: In the margin that increases workpiece fill of conference occurrence welding line is not worth or superfluous phenomenon, perhaps discover on orbit not fused welding wire is leftover. 3.

The cause that quality blemish causes (1) wrong working space: TCP (tool coordinate is nodded) wrong or it is to program has a mistake. (2) focal lateral place is wrong: Or TCP is perpendicular the place at direction of axis of beam of light is wrong, or to program has a mistake. (3) calibration of drill rod welding wire: Welding wire did not cross focal center. (4) temperature of drill rod welding wire: Temperature of welding wire warm-up is wrong. (5) the material of drill rod welding wire: The alloy composition of material of drill rod welding wire was changed. (6) laser power: Contaminative protects glass or the arc lamp of the ageing in laser can reduce the power of laser. (7) flat: Protective gas discharge decreases or inside pipeline flat. (8) gap measure: The gap measure between the component is changing. (9) speed of feed of drill rod welding wire: The rate of welding wire feed is not constant or with solder the floating rate of lens group not conform to. (10) the speed of the robot: By program place given feed speed is wrong or robot speed occurrence wave motion. (11) the control of time: The likelihood is the problem of computational time, the switchpoint of laser and orgnaization of welding wire feed likelihood and treatment process not conform to. 4.

Weld defects and form reason correspondence to express (if express) express weld defects cause of formation to contrast the watch is being searched solder when quality blemish reason, should see a watch can serve as auxiliary tool, consult for relevant technology personnel. Technology of solder of laser drill rod already used 8 long time in limited company of Shanghai masses car, we hope to pass the article to have a pool to the quality defect case of solder of laser drill rod, to will improve quality ceaselessly henceforth, improve craft level to had laid solid foundation, also hope to be opposite other the basis that be being used or will use the person of the same trade of technology of solder of laser drill rod to provide a reference. CNC Milling