1. Adjust the soldering iron temperature before welding and keep the soldering iron clean. And adjust the temperature of the medicine (about 280 degrees).
2. Hold the solder in the left hand and the soldering iron in the right hand. First, the welding head is leaned against the intersection of the pin and the pad of the welding element,
Then the solder is sent to the intersection and the welding head.
3. The welding time is 2-3 seconds.
4. The solder joint is firm and smooth, and the size is moderate, which is generally controlled at more than 2/3 of the size of the pad.
5. The welding iron is firm and bright, and the device will not be damaged during welding.
6. There shall be no false welding, false welding or missing welding.
7. The contact angle between the solder and the metal pin of the welded part is 45-60 degrees.
8. The surface of solder joint should be smooth, free of sharp points, wrinkling, blowing, slag inclusion and pockmarks.
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9. The transition from the solder to the metal pin of the welded part should be smooth and smooth, wet and concave-convex.
The welder's common sense and methods are safe, and the operating procedures are as follows:
1, should master the general electrical knowledge, observe the general safety regulations of welders, and be familiar with fire extinguishing technology, electric shock first aid and artificial respiration methods.
2. Check whether the power cord, lead-out wire and connection point of the electric welding machine are in good condition before work, and the line crossing the roadway should be overhead or covered with protective cover; The secondary circuit and shell of welding machine must be well grounded; The covered electrode clip must be well insulated.
3. Open-air welding is not allowed in rainy days. When working in wet areas, you should stand where insulating articles are placed and wear insulating shoes.
4, mobile welding machine from the power grid wiring or inspection, grounding work must be carried out by an electrician.
5. When pushing the knife switch, the body should be skewed, and the feet should be pushed at one time, and then the welding machine should be turned on; The welding machine must be turned off first, and then the power switch can be unplugged.
6, mobile welding machine position, must first stop the power supply; If welding stops suddenly, please turn off the welding machine immediately.
7. When welding in crowded places, a fence should be installed to block the arc light. When there is no fence, remind people around you not to look directly at the arc light.
8. Wear gloves when replacing covered electrode, and don't lean on iron plates or other conductive objects. Wear protective glasses when tapping slag.
9, when welding non-ferrous metal equipment, should strengthen ventilation detoxification, use filter gas mask when necessary.
10. In case of gas leakage, when repairing the gas pipeline or welding, you must inform the gas station and the fire and safety department in advance and get permission before you can start working. Before work, the gas source must be turned off and ventilation should be strengthened to eliminate the blown gas.
1 1. Turn off the welding machine after work, and then disconnect the power supply.
Operating procedure of gas shielded welding machine
First, before work
1 The grounding of welding machine and heater must be reliable, and the insulation of welding torch must be good.
2. The gas valve of the gas cylinder or pipeline should be intact, and the bottle cap should be covered when handling the gas cylinder.
3. The fluctuation range of power supply voltage should not exceed 10% of the rated input voltage.
4. All kinds of instruments and meters on the welding machine should be complete and in good condition.
5. The tool accessories are complete and intact.
6 The working environment should meet the requirements.
7 Check whether the bottom of the welding machine is clean and free of sundries, and strictly put an end to the existence of metal particles.
Second, at work.
1 After passing the pre-shift inspection, turn on the main power switch first and then the control power switch. The green light indicates that the welding machine is normal.
2 Check whether the cooling fan operates normally and the air path is unobstructed. It is forbidden to use uncooled equipment.
3 turn on the gas check switch, open the gas valve and check whether the gas valve is in good condition; Adjust the gas flow at 10? /FONT & gt； 20 liters/minute.
4 Connect the transmission part of the wire feeding mechanism, check whether the wire feeding speed is uniform and adjust it to a suitable value.
5 Connect the main welding circuit for trial welding. According to the welding process requirements, adjust the current, voltage, wire feeder pressure and the distance between the welding nozzle and the base metal, and observe the weld quality at any time. Modify it and adjust it to a better position.
6 After everything is normal, welding can be carried out.
7 When using welding torch, the following matters should be paid attention to:
(1) In continuous use, the welding current and load duration of the welding torch should be controlled within the range specified in the rating table of all welding torches.
② In order to prolong the service life of nozzles and contact nozzles, a layer of anti-sticking agent should be coated before use to prevent them from sticking to welding slag.
(3) Clean the nozzle frequently to prevent splashing from blocking the air outlet, ensure the smooth gas path, and prevent the short circuit of welding power supply from damaging the electrical components in the machine. When using, be sure to check the contact nozzle. If it is worn or blocked, it should be replaced immediately.
(4) The welding torch should be placed in a reliable place after use, and it is strictly prohibited to put it on the weldment.
Pay attention to welding wire transportation at any time during work. The tensioning wheel shall not be too loose or too tight. The welding wire wheel tube shall not have sharp bends, and the minimum radius of curvature shall be > 300 mm..
9 It is forbidden to use fans at the welding site to ensure the protective effect of gas.
10 When leaving the post, the gas circuit and circuit should be closed and the power supply should be cut off before leaving.
Third, after work
1 Turn off the gas path and circuit, cut off the power supply, clean up the work site, check and extinguish the sparks at the site, and put the tool accessories in the designated place.
2. Do a good job of welding machine maintenance according to the maintenance procedures.
3 do a good job of succession.
1. The equipment shall be in the charge of special personnel, and the operators shall wear work clothes before operation. Insulate shoes and gloves and wear a protective mask. Wear a protective mask when welding in a poorly ventilated place.
2. It is forbidden to use in places with flammable and explosive gases and articles. When adjusting the tungsten rod of the welding bolt, it should be closed and the equipment should be used according to the marked duration rate.
3. The welding torch should be handled with care, kept clean and dry, and it is forbidden to contact water, oil or other liquids and dust. It is forbidden to step on the welding cable.
4. Regularly check whether the fastening screws and lead joints inside the welding machine are loose, and eliminate hidden dangers in time. The distance between the welding power supply and the welding position is more than 3 meters to prevent the welding machine from vibrating during transportation.
Argon arc welding operation procedure
1. Before welding, prepare an argon gas bottle, install an argon gas flowmeter on the bottle, and then connect the gas pipe with the air inlet hole on the back plate of the welder. The joint should be tight to prevent air leakage.
2. Connect the argon arc welding gun, gas connector, cable quick connector and control connector to the socket corresponding to the welding machine respectively. The workpiece is connected with the "+"connecting bolt through welding ground wire.
3. Connect the power cord of the welder and check whether the grounding is reliable.
4. After turning on the power supply, choose AC argon arc welding or DC argon arc welding according to the welding needs, and turn the line switch and control switch to AC or DC. Note: These two switches must be used synchronously.
5. Turn the welding mode switch to the "argon arc welding" position.
6. Open the argon bottle and flowmeter, and turn the gas test switch to the "gas test" position. At this time, gas flows out from the welding torch. After adjusting the gas flow, pull the gas testing and welding switch to the "welding" position.
7. The welding current can be adjusted by the current adjusting handwheel. The clockwise rotation current decreases and the counterclockwise rotation current increases. The current adjustment range can be limited by the current size changeover switch.
8. Select a suitable tungsten rod and corresponding chuck, then grind the tungsten rod into a suitable taper and install it in the welding gun. After the above work is completed, press the switch on the welding gun for welding.