Drug skin types: are not already required the type of power supply types: does not require the main features: zirconia, rutile and alkaline type in some of the electrode, these new slag system has not yet formed a series of drug skin types: titanium dioxide power Type: DC or AC main features: contain large amounts of titanium dioxide electrode process performance, stable arc, then arc, spatter is small, the penetration shallow, slag coverage, easy slag detachability, particularly appearance of the weld ripple can be all-position welding, especially appropriate for sheet metal welding, weld plastic and less crack resistance. With drug skin changes in the amount of potassium, sodium and iron, divided into high titanium potassium type, high-titanium sodium and iron titanium. Drug skin type: titanium calcium type of power: DC or AC main features: drug containing titanium dioxide in the skin for more than 30%, 20% calcium, magnesium carbonate, the electrode process performance, slag fluidity, and general penetration, arc stability, weld appearance, easy slag detachability, suitable for all position welding , such as the J422 is guilty of this type, is the currently the most widely used carbon steel electrode welding rod. Drug skin type: ilmenite type of power: DC or AC main features: drug skin containing ilmenite 305, electrode melting fast, good slag fluidity, penetration deep, easy slag detachability, solder wave neat. stable arc, welding wire, fillet welding process performance is better, lesser vertical welding weld has good crack resistance. drug skin types: iron oxide type of power: DC or AC main features: drug skin contain large amounts of oxidation iron and more ferromanganese Deoxidizer of, penetration, melting fast, high welding productivity, stable arc, then arc welding of overhead position welding is more difficult, splashing slightly larger weld thermal cracking performance than good for plate welding. Arc force, suitable for field operation. Drug skin by adding a certain amount of iron is iron titanium oxide type drug skin types: cellulose types of power supply: DC or AC main features: drug skin containing more than 15 percent organic matter, about 30% of the oxidation titanium, good welding performance, stable arc, Arc force, penetration, slag, slag detachability. Can be used for vertical down welding, forming welding deep penetration or one-side welding. Li, Yang welding consumable. Applicable to the welding of the sheet structure, fuel tank, pipeline, vehicle shell. Arc stabilization agent with the drug skin content of the binder, divided into high-cellulose sodium (DCRP), two types of high cellulose potassium.
Using the Ar/CO2 mixed shielding gas Welding WiresCO2 shielding gas, it can maintain a molten pool heat and liquid level, a more thorough response of molten pool, the weld toe part is easier to melt fully. Therefore, it greatly increased the weld forming ability and weld quality.
In addition, Ar/CO2 mixed gas protect welding spatter is small, the weld quality is greatly improved, while reducing time and cost of cleaning up after welding. Low spatter also improves the cost of ultrasonic weld inspection, splash too much, then, is to ensure the accuracy of the ultrasonic testing, must be cleared in advance splash.
In addition, a quality problems that affect the shape of the weld appearance is to protect the sensitivity of the gas on gas mark. Gas mark, a similar earthworms crawl marks or chicken scratches, defects, some of the minor groove sometimes weld surface. They are caused by the weld metal in the dissolved gas, these gases in the molten pool solidification forward, but was stranded in the solidification of the slag below.
Ar/CO2 gas mixture protection than the protection of pure CO2 gas has a higher gas mark sensitivity. Splash transition characteristics of the Ar/CO2 shielding gas resulted in a large number of small droplet, which increases the droplet surface area, resulting in the weld metal to dissolve large amounts of gas. In addition to the type of shielding gas will affect the sensitivity to gas mark, there are other factors, but they do not belong in this article within the scope of Some of the major applications of commonly used protective gas
Over the years, some of the major occasions FCAW-G protection of gas has been gradually formed standards. For example, in the flat welding and horizontal welding high deposition welding applications, typically using CO2 gas shielded, because in these Welding Electrode Material, Ar/CO2 mixed gas protection does not have much advantage.
The shipbuilding industry is also usually like the CO2 gas and CO2 gas shielded arc characteristics better able to burn the base metal primer. The offshore construction industry in North America, next to the welding of T-, Y-and K-type connector groove welds smooth weld shape and smaller spatter using Ar/CO2 mixed gas is more suitable. Construction workshop more than a gas-shielded welding processes, such as GMAW and FCAW-G, usually two processes, the standardization of protective gas. Sometimes, in order to get a better splash rate and pulse arc transition, and many manufacturers also protected Select Ar/CO2 gas mixture for GMAW welding.