Ark Welding Covered Electrode

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100 Boxes carton
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10000 Boxes per Month carton/month

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Product Description:


SF-0  SF SF-2SF-3


Arc welding covered electrode


SF-0  low hydrogen type    tip color  green


SF    low hydrogen type    tip color  violet


SF-2  lime-titania type      tip color  vermilion


SF-3  low hydrogen type    tip color  orange


APPLICATIONS : SF series is used for direct armour (hard facing) of cast iron metal molds.



  1. You can overlay directly to the cast iron with these electrodes, and can obtain the predetermined hardness at the 2-3rd layer.

  2. The first layer changes to austenite and the 2-3rd layer changes to martensite.

  3. You do not have to underlay, and can armour with one kind of electrode.

  4. SF-0 , SF are good for armour to the cutting-edge because of their high hardness.

  5. SF-2, SF-3 are good for the drawing die and for bead-laying.



  1. It is effective for preventing the cracks to weld with preheating of about 100°C and with interpass temperature. Over 150°C preheating and interpass temperature should be avoided.

  2. Adopt the arc starting plate method or the backstep welding method, because the start part tends to generate blowholes.

  3. Weld with the current as low as possible. The arc length should be short, the weaving should avoid, and the bead length should limit to about 100 mm, and be sure to perform peening.

  4. Re-dry the electrode for 30-60 minutes at 200-300°C before using.




Product No.

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Q:3.2 how much is a package of bridge electrode
This depends on what kind of electrode, such as J422 welding rod, 3.2mm package is five kg, the price is about twenty yuan. If it is J507 electrode and so on, the price will be higher, such as A132 and other stainless steel prices will be much higher.The electrode (coveredelectrode), is the metal coating in the welding core (coating), uniform centripetal pressure applied to core. The core metal cored electrode, in order to ensure the quality and performance of the weld, there are strict rules on the contents of metal elements in the core, especially for harmful impurities (such as sulfur, phosphorus content, etc.) should be strictly restricted, better than the base metal. The electrode consists of two cores and coating composition. The different cores are also different. The core components directly affect the composition and properties of the weld metal, so the harmful elements in the welding core to as little as possible.For welding of carbon steel and low alloy steel welding core, are mostly made of low carbon steel as the core, and adding manganese, silicon, chromium, nickel and other components (see wire national standard GB1300 - 77). The reason of low carbon is a low carbon steel wire plastic, wire drawing is relatively easy, on the other hand can reduce the CO content of reducing gas, reduce spatter or porosity and increased weld metal solidification temperature, favorable for overhead welding. The addition of other alloy elements mainly guarantees the comprehensive mechanical properties of the weld, and also has some effect on the welding process performance and the removal of impurities.
Q:Advantages and disadvantages of titanium calcium electrode
Titanium calcium electrode belongs to J422 (E4303). It has good process, stable arc, beautiful welding seam, but low impact toughness and strength. It is not suitable for welding with high structural performance requirement.J507 low hydrogen type basic welding rod, basically contrary to J422. The process is bad, the arc is unstable, only the direct reverse welding and short arc welding can be used. However, because of the strong hydrogen removal ability, hydrogen cracking and defects are not produced, and the impact toughness is high, which is suitable for welding with high structural performance requirements.Developing and checking textbooks at home and abroad
Q:What are the symbols for the electrodes?
Classification and symbol of welding rod brandClass symbolStructural steel welding rod JMolybdenum and chromium molybdenum heat resistant steel welding rod RLow temperature steel electrode WStainless steel welding rod G or ASurfacing electrode DCast iron welding rod ZNickel and nickel alloy welding rod NiCopper and copper alloy welding rod TAluminium and aluminium alloy welding rod LSpecial purpose welding rod TS
Q:What kind of welding rod does Q345 steel use?
Weldability of Q345 steelQ345 low alloy high strength structural steel with carbon content of 0.18% ~ 0.20%, tensile strength equal to 470-630MPa. Q345 steel alloy content is less, good weldability, welding generally without preheating.But because the Q345 steel hardened tendency is slightly larger than the low carbon steel, so at low temperatures (such as winter outdoor operations) or welding in high rigidity, large thickness of the structure, in order to prevent the cold crack, need to take measures to preheat. The preheating temperature of 16Mn steel at different plate thickness and different environmental temperature is shown in table 8.Q345 steel welding should be used in E50 type electrode, such as E5015, E5016 for alkaline electrode, the structure is not important, also can choose E5003, E5001 acid electrode. For the weldment with small thickness and narrow groove, E4315 and E4316 welding electrodes can be used.Table 8 preheating temperature of welded Q345 steelThickness of weldment (mm) preheating thermometer at different temperatures (DEG C)More than 16 of not less than of-10 DEG C - C without preheating preheated to 100 to 150 DEG C16 ~ 24 of not less than 5 DEG C 5 DEG C without preheating preheated to 100 to 150 DEG C25~40, not less than 0 degrees Celsius, not preheated, 0 degrees below 100~150 preheating temperatureMore than 40 are preheated 100~150 degreesSubmerged arc welding of Q345 steel H08MnA welding wire with flux HJ431 (open I butt welding wire with flux HJ431) or H10Mn2 (plate groove butt), when the deep groove weld of thick plate welding, welding wire with flux HJ431 H08MnMoA should be used.Q345 steel is the most widely used low alloy steel in our country at present,
Q:What's the difference between 507 and 422 electrodes?
507 is the welding manganese steel material, and the 422 is the general steel, that is, low carbon steel
Q:Why should the welding electrode prevent moisture? What happens if you get soaked by water?
Because if there is no moisture prevention, there will be welding impurities, welding seam, welding defects are not strong, and may affect the strength of base metal
Q:How thin is the smallest electrode?
The smallest electrode is the diameter of the electrode (mm) 1.6, the welding current (A) 25~40.
Q:Shelf life of stainless steel electrode
There should be some
Q:What welding rod does 16MnDR use?
16MNDR can use E5015 low temperature welding rod.E5015 low temperature welding rod:Features: low hydrogen and sodium type low temperature steel electrode with nickel, direct reverse welding, all position welding, and welding metal still has good impact toughness at -60 centigrade.Uses: welding -60 degrees, low temperature steel structure, such as 13MnSi63, 09MnNiNb, E36 and so on.Material (deposited metal chemical composition):C Mn 1.2-1.7 = 0.07 Si = 0.5 Ni S = 0.035, P = 0.035, 0.2-1Other: B = 0.003, Ti = 0.03
Q:What is the difference between A302 stainless steel electrode and A402 stainless steel electrode?
A302 is Cr23Ni13 stainless steel electrode titanium calcium type coating for welding, the same type of stainless steel, lining stainless steels (Cr19Ni9 low carbon steel and high chromium steel and high manganese steel) etc.. A402 is Cr26Ni21 pure titanium calcium type austenitic stainless steel electrode coating, for the same type of heat-resistant stainless steel under high temperature welding, can also be used for large steel hardening (such as Cr 5 mo, Cr 9 mo, Cr 13, Cr 28) and welding of dissimilar steel.
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