(1) drug skin types: the type is not a type of power has been provided: does not require the main features: the use of electrodes in some zirconia, rutile basic type, the slag of these new series has not yet formed
(2) coating types: titanium dioxide power supply type: AC or DC Features: with large amounts dioxide, welding process with good performance, stable arc, then arc convenient, splash a small, shallow penetration, slag coverage good, easy to slag off the weld ripple special appearance, can be all-position welding, especially suitable for welding thin plate, but slightly lower weld plastic and crack resistance. With the coating of potassium, sodium and iron and other changes in the amount, divided into high titanium potassium, high sodium and iron titanium titanium, etc.
(3) coating types: titanium calcium type Power Type: AC or DC main features: titanium dioxide coating containing more than 30%, calcium and magnesium carbonate 20%, the electrode process in good slag fluidity, penetration in general, arc stability, weld appearance, easy slag removal for all position welding, such as the J422 is guilty of this type, is the most widely used carbon steel electrode in a welding rod.
(4) coating type: ilmenite-type power supply type: AC or DC Features: ilmenite containing coating 305, the electrode melting fast, slag fluidity, deep penetration, easy slag, welding wave neat, stable arc welding, fillet welding performance is better, a little sub-vertical  welding rods , the weld has good crack resistance
(5) coating types: iron oxide-based Power Type: AC or DC main features: contains large amounts of iron oxide coating and more of the ferromanganese deoxidizer, deep penetration, melting speed, high productivity welding, arc stability , then arc convenient, vertical welding, Yang welding more difficult, splash larger, better performance of the weld thermal crack for plate welding. Arc force as big, suitable for outdoor operation. If the coating by adding a certain amount of iron powder, iron powder titania type was
(6) coating types: cellulose-based Power Type: AC or DC Features: coating containing more than 15% organic, 30% titanium dioxide, good performance welding process, arc stability, arc blowing force, melting deep, less slag, slag easy. Can be used for vertical down welding, deep penetration welding or forming side welding. Li, Yang welding technology is good. Sheet structure for the fuel tank pipes, vehicles, housing, such as welding. With the stable arc coating agent, binder content, divided into high cellulose type (using DC reverse), two types of high cellulose type K (7) drug skin types: low hydrogen potassium type (low hydrogen sodium type ) Power Type: AC or DC (direct current) main features: coating composition dominated by carbonate and fluorite. Electrode prior to use shall be subject to 300 ~ 400 ℃ baking. Short arc operation, welding process in general, can be all-position welding. Weld crack resistance and good mechanical resistance force. Important for welding the welding structure. Stable arc coating in accordance with the dose of different iron content and binder, divided into low sodium, low potassium and iron powder low hydrogen type, etc.
(8) coating types: graphite-based power supply type: AC or DC main features: contains large amounts of graphite coating, typically used for cast iron or welding rod. Low carbon steel welding core, the welding process performance is poor, splash more, smoke more, less slag, suitable for flat welding. When using non-ferrous metal core welding, can improve their process performance, but the current is too difficult
(9) drug skin types: base type of power supply types: DC Features: coating containing large amounts of chloride and fluoride, mainly for aluminum and aluminum alloys. Strong moisture absorption, drying before welding. Coating of low melting point, mig welding electrode melting fast. DC power supply, poor welding, short arc operation, corrosive slag after welding required hot water addition, the coating contains large amounts of iron powder electrode, can be called the iron rod. At this time, in accordance with the corresponding main component of welding rod coating, can be divided into iron titanium, iron titanium calcium, iron ilmenite type, type of iron oxide, iron powder low hydrogen type, which form the iron powder electrode series.

â‘  different intensity level + low alloy steel (or low-alloy steel + low-alloy high strength steel)
General requirements for weld joint strength of metal or of not less than two minimum strength of welded metal, selected the strength of deposited metal electrode should be able to guarantee the strength of the weld and the joint strength of not less than the lower strength of base metal guillotine, while the weld metal ductility and impact toughness of high strength should be not less than the base metal and plastic guillotine poor performance. Therefore, according to the two lower intensity level among the selected Carbon Steel Electrode. However, in order to prevent cracks, should be a higher intensity level, poor welding steel welding process to determine, including the welding specifications, preheating temperature and post weld heat treatment.
â‘¡ low-alloy steel + stainless steel
Shall be in accordance with the chemical composition of deposited metal values ??in the selection of qualified welding rod, generally used in higher levels of chromium and nickel, plastic and good crack resistance of austenitic steels Cr25-Ni13-type electrode, in order to avoid brittle hardened tissue caused by cracks. However, poor welding of stainless steel should be determined welding process and specification.
â‘¢ stainless steel sheet
Consideration should be given to grass-roots, complex layer, transition layer welding performance requirements using the three electrodes. Grass-roots (carbon steel or low alloy steel) welding, choose the appropriate intensity level of structural Carbon Steel Welding Electrode  ; multiple layer contacts directly with the corrosive media, should use the corresponding components of austenitic stainless steel electrode. The key is the transition layer (ie, stratified with the primary interface) welding, must take into account the dilution of base material should be selected with higher levels of chromium and nickel, plastic, and a good crack resistance of austenitic steels Cr25-Ni13-type electrode.

Keywords: welding rods