Ark Welding Covered Electrode

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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.

CHARACTERISTICS

You can overlay directly to the cast iron with these electrodes, and can obtain the predetermined hardness at the 2-3rd layer.
The first layer changes to austenite and the 2-3rd layer changes to martensite.
You do not have to underlay, and can armour with one kind of electrode.
SF-0 , SF are good for armour to the cutting-edge because of their high hardness.
SF-2, SF-3 are good for the drawing die and for bead-laying.

NOTE ON WELDING OPERATION

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.
Adopt the arc starting plate method or the backstep welding method, because the start part tends to generate blowholes.
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.
Re-dry the electrode for 30-60 minutes at 200-300°C before using.

TYPICAL HARDNESS OF WELDED METAL (as welded)

Product No.	1st layer(HV)	2nd layer(HV)	3rd layer(HV)
SF-0	440-540	550-650	600-700
SF	250-350	460-560	460-560
SF-2	250-350	460-540	440-500
SF-3	250-350	360-440	360-440

OPTIMUM WELDING CURRENT (AC or DC +)

Diameter(mm)	2.6	3.2	4
Length(mm)	300	350	400
Current(A)	70-90	90-110	110-130

Q: What welding rod should be used for welding between No. 20 and No. 45 steel?: J427When welding, pay attention to the small current at the bottom, and the weldability of No. 45 steel is poor

Q: Types of electrodes: Ask me, the welding rod according to the diameter commonly used has 2.5, 3.2, 4. According to the use of ordinary, stainless steel, cast iron, wear-resistant electrode. Among them, the ordinary electrode according to grade 422506 and 502, stainless steel 102, 132, cast iron points 302, 402. Electrode wear is generally used in digging bucket, carbon and some high wear resistant. These are commonly used welding rod, and some special electrode, the amount is very small. Generally speaking, the higher the grade of the electrode, the more expensive the price. Little dragon, what else do you know? Ask me!

Q: When 507560 electrodes are used at the same time, which electrode should be selected?: Should be 506 electrodes bar, J507 is DC alkaline welding rod, and J506 is AC and DC dual basic electrode.Their selection depends mainly on the welding properties, if welding welding seam is important, the general should use J507 electrode; if the weld is not high, is connected to weld, then select the J506 electrode.In addition, if only the AC power supply, you can only choose J506 electrode.In short, under normal circumstances, the basic electrode should try to choose the DC power supply electrode, because it tends to be less than the gas and DC welding electrode.

Q: Welding rod heat preservation barrel should be clamped in the welding machine: The electrode holder is clamped on the output terminal of welding machine (or welding machine quick socket).Electrode holding barrel:First, the use of methods:Put the baked electrode into the barrel and take it with you. If the cooling, with the original plug a clamped welder + pole, a clamp of electric welding machine, can be heated.Two. Why should it be kept warm?:Heat preservation is to keep the electrode dry. In the workshop, some electrodes are afraid of moisture, and wet welding electrodes will affect the quality of welding. Therefore, after baking the electrode placed in the heat preservation cylinder, with the use of take.

Q: Is there any difference between E308 welding rod and 308?: You are not engaged in welding, this problem is puzzling. E308 is the electrode type, that is, corresponding to the domestic A102 stainless steel electrode brand. 308, a single number, what does not mean ah, including E308, R308, A308, and so on, who knows what you mean?

Q: E43XX welding electrodes are often used in welding of steel structures, of which 43 is indicated: 1) the brand of welding rodTaking structural steel as an example: designation. JXXX, J for structural steel welding rod, third figures, representing the type of leather, welding current requirements, first, second number: on behalf of weld metal tensile strength.2) model of welding rodThe type of welding rod is determined by the relevant national standards and international standards. EXXX, structural steel, for example, model establishment method for the letter "E" said electrode, first, second said that the minimum tensile strength of weld metal, third digit electrode welding position, the third, fourth digits of the welding current type and type of coating.For example, the model is E4303 brand, that is, J422 J representative of institutions, steel electrode 42, said tensile strength 2, indicating the skin type

Q: Why should the electrode be baked before use?: I don't want to tell you anything that is very theoretical and very textbook. Our project is very wet in the south, so the steel production base often does.The main reason for baking the electrode is (or to prevent) the welding rod from being wetted.Welding rod after wetting, in the welding of workers will indirectly cause more slag, more bubbles, the current is not good control, burn the main tendons, and the strength of the steel bar connection will not meet the design requirements.

Q: Generally, how many packs are in one case and how many KG in one package?: A case of 5 bags, a pack of 5kg

Q: What is bubble welding? What's the difference between a common electrode and an ordinary one?: Now, there are still two people suspected of welding costs?Do not know that science and technology is the primary productive force?!Said the first two welding material, welding wire electrode 8 dollars a kilogram, 6 yuan a kilo, looks cheap electrode.You have to see how much of the filler metal left in the weld after welding is equal to the price.1, the outside of the electrode coating, and finally the welding slag and protective gas, does not belong to the filler metal.2, each electrode has a welding rod head, at least 5 centimeters, have to throw away, does not belong to the filler metal.3, welding rod splash, splash of metal, does not belong to the filler metal.In addition, other costs, welding rod to dry, need oven, heat preservation barrel, heating electricity, throw away the welding rod.Let's talk about the same welding power, welding, welding heat input two is small, costs less power, more power inverter welder.What's more about efficiency and speed?.1, do not bake electrode, save time, minus a manual.2, do not change electrode, also need not from new arc, save time3, do not knock the welding slag off at least a coolie.4, for welding speed, two welding is three times of welding rod. (on this one, a welder can top three, you have to calculate how much money, artificial!)

Q: What type of pig iron electrode?: Pig iron electrode is cast iron electrode, the vernacular is the pig iron electrode.Cast iron electrode commonly used model:CMC-E46NDirect welding on cast iron is very effective for metal wear of stamping dies. The first layer of welded metal is austenitic, and the martensite is from the 2 layer, so the wear resistance is good. Flame hardened cast iron can also be directly welded.CMC-MS64NCast iron welding rod, high strength and good plasticity. Suitable for gray cast iron and nodular cast iron, and can be machined.CMC-E47NDirect welding on cast iron is very effective for metal wear of stamping dies. The first layer of welded metal is austenitic, and the martensite is from the 2 layer, so the wear resistance is good. Flame hardened cast iron can also be directly welded.CMC-E67NEspecially suitable for cast steel hardfaced making render buffer layer, cracking of welding, welding reconstruction.CMC-E65NCmc-e65n low temperature welding, low expansion coefficient, slight hardening, especially suitable for cast iron cast steel (fc.fcd) steel hardfaced making render buffer layer.CMC-E61NSuitable for welding all kinds of cast iron, alloy cast iron, steel and cast iron joint, nickel and its alloy, or welding of water proof die castings.WE777 special cast iron welding rodSuitable for the full range of cold welding welding, welding cast iron base material can almost all, and it is easy to achieve cast iron and carbon steel dissimilar metal welding, such as solving matrix fracture, crack, wear, hole filling defects after welding can be machined, many applications in the engine casing, cylinder head, casting machine, gear base the tooth of iron castings.

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