Follow these principles when welding ① The thicker the plate, the thicker the welding wire； the greater the power, and the slower the wire feeding speed ② The lower the power, the whiter the welding surface. The greater the power, the weld seam will change from color to black, and the single-sided form will be formed at this time. ③ The thickness and fineness of the welding wire should not be larger than the plate thickness instead of closing to the plate thickness. The welding wire will also affect the fullness of the weld. ④ The thinner the weld wire, the lower the scanning width. Affected by different brands of lasers, the following processes use the following laser to do proofing tests. But it is for reference only, and need to be fine-tuned appropriately when using ①Tottenham Hotspur / Chuangxin / Jept ②Argon I. Carbon steel/galvanized sheet Note: Affected by the zinc layer of the galvanized sheet, the power of the galvanized sheet can be appropriately reduced. II. stainless steel Stainless steel power of 3000W can have a reference to carbon steel III. aluminium The aluminum process refers to stainless steel process, the power can only be increased by 20%-30%. What’s more, there are also differences in the focus, which need to be adjusted manually. Reference:  0.5MM stainless steel internal corner welding The scanning speed of 0.8 stainless steel wire is 350, the scanning width of it is 2, the peak power of it is 350, the duty cycle of it is 100, and the frequency is 2000. The light penetrates the plate, and the amount of deformation is very large, so we taka action of reducing the power. The scanning speed of 0.8 stainless steel wire is 350, the scanning width of it is 2, the peak power of it is 260, the duty cycle of it is 100, and the frequency is 2000. The amount of deformation has been reduced, but it is still easy to be burnt when the light starts flowing out, that’s the reason why we continue to reduce the power in the process. The scanning speed of 0.8 stainless steel wire is 350, the scanning width of it is 2, the peak power is 200, the duty cycle of it is 100 and the frequency is 2000. The effect is as follows ①. When you increase the width to 3 is as it shown in figure ②.

Why do stomata appear？ 1.1 The inside of the laser welded hole is in an unstable vibration state, and the flow of the hole and the molten pool is very intense. The metal vapor inside the hole erupts outwards and leads to the steam vortex formed at the opening of the hole, which rolls the protective gas (Ar) into the bottom of the hole, and with the hole moves forward, these protective gases will enter the molten pool in the form of bubbles. Due to the extremely low solubility of Ar and the rapid cooling rate of laser welding, the bubbles are left in the weld seam before they can escape to form stomata. What’s more, it was caused by the poor protection during the welding process that nitrogen invades the molten pool from the outside, and the solubility of nitrogen in liquid iron is very different from the solubility of nitrogen in solid iron. Therefore in the cooling and solidification of the metal, the solubility of nitrogen decreases with the decrease of temperature when the molten pool metal is cooled to the beginning of crystallization can lead to a large sudden decrease in solubility. At this time a large amount of gas precipitates will form bubbles. If the floating rate of the bubbles is less than the metal crystallization rate, the pores are generated. The way of laser fusion welding suppresses porosity 1. Suppress welding pores by pre-welding surface treatment Pre-welding surface treatment is an effective method to control the metallurgical pores of aluminum alloy laser welds. The surface treatment methods can be divided into physical mechanical cleaning and chemical cleaning usually. After comparison, taking the chemical method to deal with the surface of the test board (metal cleaner cleaning - washing - alkali washing - washing - washing - washing - drying) is the best. Among them, the alkali wash is removed from the surface thickness of the material with an aqueous solution of 25% NaOH (sodium hydroxide), and the pickling is carried out with a 20% HNO3 (nitric acid) + 2% HF (hydrogen fluoride) aqueous solution to neutralize the residual lye. After the surface treatment of the test plate, the welding is carried out within 24 hours, and the assembly before welding is assembled and wiped with anhydrous alcohol when the test plate is installed for a long time after the test plate treatment. 2. Inhibit welding pores by welding process parameters The formation of weld porosity is not only related to the quality of weldment surface treatment, but also related to welding process parameters. The influence of welding parameters on the pores of the weld is mainly reflected in the penetration of the weld, that is, the influence of the back width ratio of the weld on the pores. By testing we can know that it can be seen that when the weld back width ratio R is > 0.6, the concentrated distribution of the chain pores in the weld can be effectively improved. And when the back width ratio R is > 0.8, the existence of atmospheric pores in the weld...

This article applies to professional cleaning systems ①Cleaning process Scanning frequency: the swing speed of the motor whose range is 10-100Hz, and it is recommended to set 80 Scanning width: The scanning width of the spot whose range is 0-300mm, which should be selected in the system settings according to the specifications of the focusing mirror actually used Peak power: to be regarded as the defaults to the maximum power of the laser generally Duty Cycle: the default data is 100% Pulse frequency: the default data is 2000 After setting the parameters, if you import and go back, and you can see this process on the left side of the home page ②Confirmation of focus Through the scanning of back and forth, near and far, the focus is when the sound is the largest and the spark is the largest. At that time, the cleaning should be carried out according to this distance because the energy is the strongest Depending on the difference of the use of focusing, the following is a reference F400 focus ( the distance from the tip to the plate is about 35-40 cm or so when the energy is the strongest generally) F800 focus (the distance from the tip to the plate is about 65-75 cm or so when the energy is the strongest generally) ③The use of gases Gas selection for cleaning: air should be not less than 5 kg, oil-free and water-free should be filtered or other inert gases should be used when it is above three levels When cleaning, be sure to keep the distance from the tip to the plate stable and the hand speed be even.

Analysis of black smoke 1, It is hard for the entire industry to achieve the goal that laser welding doesn’t produce a little bit of black smoke completely nowadays. Because of black smoke,   laser welding and laser cutting are the same, and a smoking device is requested in the laser cutting machine. 2, When compared with laser welding and traditional gas metal arc welding, argon arc welding has its unique advantages. From the perspective of black smoke, gas metal arc welding is more serious than laser welding. Because the speed of argon arc welding is slow, it will generate black smoke but not very obvious visually. What’s more, because laser welding’s arc is small, we see the black smoke is clearer. Due to the laser welding machine is a new technology product that has just been come out in the past two years, everyone has higher expectations for the laser, which is very normal psychologically. 3, There are two kinds of black smoke for laser welding currently. One is large enough to have a black accumulation on the workpiece, and the other is that there will be black smoke in the air which we cannot let the more obvious black smoke accumulation currently, but there will still be in the air. 4, We have several tests on how to reduce black smoke in the air. We also communicated with some peers according to our test situation. The factors of generating black smoke A. Black smoke generated in welding has a lot to do with the materials of welding. Different welding materials’ black smoke size is different. We have done aluminum alloy welding before. Find that different aluminum alloy welding materials generate black smoke that their sizes are very different. B. If there is an oil film protection or oxide layer on the surface of the workpiece, then the welding black smoke will be larger. C. Black smoke and welding wire are related. The current welding wire is the traditional welding wire, and there is no welding wire specifically for the laser industry, which leads to laser industry is not easy to control. It is recommended to use the existing smokeless welding wire. D. Black smoke generated in welding and welding process are related, such as it also is related with welding speed and techniques. For example, welding aluminum at low power may have less black smoke than high power welding. E. The damage of the lens will be poor in welding usually.

This article applies the 3-in-1 cleaning mode 1. Switch cleaning program:Through the toggle button in the upper right corner of the home page, you can switch the program ,break and restart. 2. Replace the suitable focusing mirror: You can directly use the focusing lens of the welded F150 (cleaning width is 20mm) or replace the cleaning F400 focusing lens (cleaning width is 40mm-60mm), which can make choices according to the lens used in the corresponding selection in the setting. 3. Remove the locking part in front of the gun head ①Cleaning process Scanning frequency: the swing speed of the motor, whose range is 10-100Hz. It is recommended to set 80. Scanning width: The scanning width of the spot that its range is 0-40mm, and it should be selected in the system settings according to the specifications of the focusing mirror actually used. Peak power: we usually regard it as the maximum power of the laser. Duty Cycle: Default data is 100% Pulse frequency: Default data is 2000 After setting the parameters, if you import and go back, you can see this process on the left side of the home page ②Confirmation of focus Through the scanning of the distance back and forth as well as near and far, the focus is when the sound is the largest and the spark is the largest, and the cleaning should be carried out according to this distance. In this time the energy is the strongest. Depending on the difference of the use of focusing, the following is a reference F150 focus (generally the distance from the tip to the plate is about 10-15 cm or so) F400 focus (generally the distance from the tip to the plate is about 35-40 cm or so when the energy is strongest) ③The use of gases Gas selection for cleaning: air not less than 5 kg, oil-free and water-free should be filtered or other inert gases be used when above three levels When cleaning, be sure to keep the distance from the tip to the plate stable and the hand speed even

I. The use of copper nozzles The classification of copper nozzles is mainly distinguished: whether to feed wire, the size of the welding wire, the welding angle, as shown in the figure above, for an example, the inner corner wire feeding welding 1.0 welding wire uses AS-12 cooper nozzle. II. Selection of welding wire Depending on the differences of the welding plate, we need to use different welding wires (gas-protected solid cored welding wires) Stainless steel = stainless steel welding wiree.g. ER304 Carbon steel / galvanized sheet = iron wire Aluminum = aluminum wire(As for aluminum welding wires, we recommend using more than 5 series of series of alloy aluminum. Because its hardness is high and not easy to get stuck.) III. Gas selection ①There are two kinds of easily seen nitrogen or argon. As for welded stainless steel, we recommend using nitrogen because that welding effect is better. But be sure do not use mixed gas or nitrogen dioxide gas. ②Air pressure requirements: the flow meter is not less than 15, and the pressure gauge is not less than 3 IV. focus Usually, 0 joule welding is used (0 of the scale tube does not mean that the focus is 0, which is affected by the laser. So we’d better be subject to the actual situation) Note: The positive focal length is the position where the laser flame is the largest and the sound is the clearest General process control of continuous penetration welding: if you can see slight discoloration traces on the back at a single point, then you can achieve better penetration welding during continuous welding; if you see obvious traces on the back, you can even feel it If it has been penetrated, then it will spatter during continuous welding, and even a deep pit will appear. Specifically, the focal length, energy and waveform should be adjusted according to the actual sample. The thinner the material, the smaller the required spot, otherwise there will be welding through.

I. The use of copper nozzles The classification of copper nozzles is mainly distinguished: whether to feed wire, the size of the welding wire, the welding angle, as shown in the figure above, for an example, the inner corner wire feeding welding 1.0 welding wire uses AS-12 cooper nozzle. II. Selection of welding wire Depending on the differences of the welding plate, we need to use different welding wires (gas-protected solid cored welding wires) Stainless steel = stainless steel welding wire  e.g. ER304 Carbon steel / galvanized sheet = iron wire Aluminum = aluminum wire(As for aluminum welding wires, we recommend using more than 5 series of series of alloy aluminum. Because its hardness is high and not easy to get stuck.) III. Gas selection ①There are two kinds of easily seen nitrogen or argon. As for welded stainless steel, we recommend using nitrogen because that welding effect is better. But be sure do not use mixed gas or nitrogen dioxide gas. ②Air pressure requirements: the flow meter is not less than 15, and the pressure gauge is not less than 3 IV. focus Usually, 0 joule welding is used (0 of the scale tube does not mean that the focus is 0, which is affected by the laser. So we’d better be subject to the actual situation)

Manifestation: In the welding state, after pulling the trigger, the air is sent to the wire, and the red light is normally visible, but the laser cannot be emitted Cause analysis: Logically, when the gas is out, the outgoing signal will also be sent out. When the laser does not receive the outgoing signal (port failure) or the laser has a problem Solution； (1) First exclude the presence of an alarm in the laser itself (2) Where it involves normal after shutdown and restart, most of them may be resettable alarms of the laser itself, it is recommended to contact the laser manufacturer or monitor the internal alarm (3) For whether the laser has received a trigger signal, two schemes to test The simplest thing is to link the laser's monitoring software to see which signal is missing. In addition, the signal port of the signal interface three can be measured Typically, the laser emits light only when it receives an enable/PWM/analog signal, so we can measure whether the signal is emitted in the operating state (Please be sure to measure each port of signal interface 3 and unplug the laser wire in working condition when air output) Enable signal: 2/4 pin output 24V voltage; PWM modulation demodulation signal: 6/7 pin   Output voltage 24V; Analog signal: 4/5 pin equal proportional voltage, 10V at full power; If the above signal is normal and still does not emit light, contact the laser manufacturer to deal with it; If one of the enable/PWM has no voltage, it can be used together, such as PWM connecting the enable signal pin; If there is no voltage in the analog quantity and the red light is a line, return to the factory to repair or replace the motherboard; If there is no voltage in the analog, and the red light is a point, check whether the 15V switching power supply ± is reversed.