Flux / electrode type Electrode medicine chemical composition of the skin arc stability, penetration, metal deposition rates and positioning capabilities have a significant impact. Electrode can be divided into three categories: Cellulose type electrode; titanium dioxide coated electrodes; alkaline electrode. 1, cellulose type electrode of drug skin contains a lot of cellulose, which is characterized by arc melting deep friction deformation speed, which increases the welding speed. However, due to rough and weld deposits of slag and liquid mixed together, so the slag is very difficult. This electrode can be used in any position, but also because of the elevated pipe ('stovepipe' welding technique) in the use of the familiar. Features: Able to form in all positions deep penetration; For downward vertical position Welding Electrodes; Good mechanical properties; Produce large amounts of hydrogen - are caused by the heat-affected zone (Haz) the risk of cracks. 2, titanium dioxide electrodes skin contains large amounts of drugs dioxide (rutile). Dioxide so that arc starting, smooth operation and reduced arc spatter arc easier. This common electrode has excellent welding characteristics. In AC or DC, they can be used for all welding positions, especially for horizontal angle / vertical angular position of the joint welding. Features: Appropriate weld metal mechanical properties; Viscous slag can form a good bead shape; Positioning may have the flow of welding slag (fluoride); Easy to remove slag. 3, the basic electrode skin contains large amounts of drug calcium carbonate (limestone), calcium fluoride (fluorite). This makes the slag type electrode of titanium dioxide slag than more mobile, this is a help up welding and soldering rapid cooling method of Yang. The electrodes used for welding medium and large-scale structure, requires a high welding quality, good mechanical properties and resistance to cracking capacity (excessive binding will crack). Features: Low-hydrogen weld metal; Demanding welding current / speed; Poor weld shape (curved surface profile, rough); Slag removal difficult; Metal powder electrode containing a metal powder coating increases, to allow the welding current maximum allowable current. Thus, drug-free iron electrode in the skin compared to metal powder metal electrode deposition speed and efficiency (metal cladding ratio) has increased in the slag is also very easy to remove. As the deposition speed, is mainly used for flat iron welding electrodes, welding and vertical welding cross. Titanium dioxide electrode and no significant alkaline arc welding characteristics, the intensity of the smaller arc, reducing the weld penetration.
Power supply Electrodes can be AC â€‹â€‹or DC power supply used. Not all DC electrodes can be used in AC, but AC electrodes can usually be used in DC power supply. Welding current The choice depends on the welding current electrode size, manufacturers recommend that users of normal operating range and welding current. Choose the standard operating range of electrode sizes as shown on the left. According to experiences, current standards are based electrode is about 40A/mm (diameter). Therefore, the electrode with a diameter of 4mm is the preferred current size of the 160A, but the actual operating range is 140 ~ 180A.
In order to eliminate the welding of insecurity and to avoid electric shock accidents, the following points should be required welder welding operation.
1, the operating personnel Welding operations are special operations, safety operations personnel must be approved by the professional and technical training, examination, to the "special operations certificate" posts are allowed to operate independently, as required to wear insulated protective equipment; 2, electrode holder Use qualified welding clamp. Electrodes can be firmly clamped, and reliable cable connection, it is not unusual heat welding tongs to keep the key. Welding tongs have good insulation properties, prohibiting the use of self-made simple welding clamp; 3, to avoid arc radiation on the human body, not directly in the eye near the arc, or to avoid direct view peep protective masks; multiple welding operations, non-combustible or flame-retardant should be set to the shield; the use of absorbent material effect interior wall finishes to reduce the arc reflection; ensure that the workplace lighting, eliminate weld blurred the ignition and then wear masks to happen; not replace any number of color filters; reform process, and change to automatic or hand-held welding semi-automatic welding, the welder may locations away from the welding operation; 4, the metal dust and harmful gases, protection, depending on the Nickel Alloy Welding Electrodes process and a reasonable place to select the appropriate protective equipment; technical measures in the selection of local and overall ventilation; in the process of environmental pollution on the selection of small or mechanized. High degree of automation and the use of low-toxicity dust electrodes and other measures to reduce dust concentrations and toxicity; 5, in order to prevent welding scalding should be put on work clothes, work shoes, work wear hats. Cotton overalls should be used and the texture of thick, good anti-burn effect. Note foot protection, soluble fiber does not wear socks. To clean the area around the weld, electrodes stacked to focus, to hot and cold electrodes were placed. When dealing with welding slag, to fasten the collar, wear protective glasses to reduce the burning burn accidents; 6, welding site prior removal of flammable and explosive materials, welding height should be set to energize the bottom plate. Stuffy house near the top inside and flammable materials should not be welded stacking operations; combustible gas pipelines and equipment and other devices connected to each other, connecting pipes should be removed or denial; 7, in order to avoid electric shock accidents, welding wire and the ground point to good contact. Electrical insulation jacket is not damaged, need to change the welding joints divert two loops; shift work or replacement of electrodes should wear insulated gloves; in metal containers or metal structure and a small welding workplace, should be used rubber mats, wearing insulated gloves, wear insulated shoes; welding clamp shell insulation to be reliable; Yu Xuetian not work in the open air; not the machine itself and the transmission part, etc., as part of the welding circuit; welding equipment installation, repair and inspection carried out by an electrician; not allowed to split repair or replace the fuse; 8, the welding cable â‘ welding cable thin copper wire in the use of multi-strand cable without connectors, lugs and welding terminal connection using compaction to prevent loosening caused by exposure to random wound bad, overheating, sparking phenomenon. Wire shield should be set on the bolt. â‘¡ Welding Wires cable length not exceed 20 ~ 30m, long wires will increase the pressure drop. â‘¢ welding cable across the channel, you must take protective cover, protective measures such as wearing a tube. â‘£ Do not use scaffolding, metal railings, rail and other metal instead of wire bonding used to prevent poor contact caused by fire and electric shock; 9, the welding does not allow overloading Overloading is not allowed to use the process of welding, or welding machine will overheat and burn or cause a fire, and insulation damage caused by overloading, but also may cause leakage of electric shock; 10, welding, should first check whether the safety of welding equipment and tools, such as welding wire and the grounding point of contact is good, welding cable insulation jacket for damage, etc.; 11, before welding on the device, first device to be connected to ground or zero line removed, and then finished welding recovery; 12, the welding work, should check the operating environment, set clear risk factors and care staff. When used with other personnel and related facilities too close, the screen should be used to protect and ensure the safety of operations and other security interval; when high welding operations must be linked to your seat belts; 13, the replacement of electrodes, the welder should wear insulated gloves; 14, in metal containers and other small metal structures on the welding workplace, the greatest risk of electric shock, must take special protective measures. Such as the use of rubber mats, wearing leather gloves, wear insulated shoes, so as to ensure that welders and welding pieces of the body between the insulation. Prohibit the use of simple non-insulated shell of the electrode holder; 15, changing the welding joints, welding replacement parts when the need to divert the secondary circuit, or transfer the work place, to suspend work or welding repair work, you must cut off the power before the operation; 16, the welder should be set in the rain and well-ventilated place. Inflammable and explosive materials are not allowed to pile up on-site welding; 17, one side of the AC arc welding machine power cord must be insulated well, not anywhere in the drag, the length should not exceed 5 meters must be set into the line at guard; 18, welder secondary wiring should adopt YHS type rubber sheathed flexible multi-strand copper cable, cable length should not exceed 30 m; 19, according to the needs of the construction, welding, or by region should focus on setting high standards, and should be numbered; 20, arranged in the welding machine should be set outdoors in a dry place and shelter shed should be located; 21, welding of the shell should be grounded, not grounded more than one series; 22, welding wire for welding of the shell of the thermal insulation resistance of not less than 0.4MΩ; 23, welding of the exposed conductive parts and rotating parts shall be equipped with safety guards, DC welding machine after the regulators taken down, exposing the holes on the chassis shield should be added; 24, welding machine power switch should be set separately, DC welding power supply should be used to start the control.