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 kinds of welding electrodes are used in the copper tubes for air conditioning? What's the difference?: There are silver electrode and two electrode containing phosphonium, the former used in high sulfur environment, the price is about 3 times higher than the latter.

Q: How are the electrodes made up?: Answer: welding rod is coated with the skin of the power supply arc welding melting electrode. It is composed of two parts covering and core wire. (L) cores. The electrode is metal cored coating called cores. The core is generally a certain length and diameter of the steel wire. When welding, the welding core has two functions: one is the conduction of the welding current, arc energy converted into heat energy; two welding core melting filler fused with the parent metal weld formation. The special steel wire used for welding can be divided into three categories: carbon structural steel, steel wire, alloy structural steel wire and stainless steel wire. (2) medicine skin. The pressure on the surface of electrode coating called coating. A coating of various minerals, such as minerals, is coated on the outside of the electrode to stabilize the arc and improve the quality of the weld. Some reducing agents should be added into the coating to restore the oxide to ensure the quality of the weld. Because of the high temperature of the arc, some of the alloying elements contained in the weld metal are burned (oxidized or nitrided), which reduces the mechanical properties of the weld. By adding ferrous alloy or pure alloy element to the electrode coating, it can be transferred to the weld metal with the melting of the coating, so as to compensate for the burning of the alloy elements and to improve the mechanical properties of the weld metal. It can improve the welding process performance, make the arc stable combustion, less spatter, good weld formation, easy slag removal and high deposition efficiency. In short, the role of the drug skin is to ensure that the weld metal to obtain the required chemical composition and mechanical properties, and make the welding rod has good welding process performance.

Q: Where to buy electrodes, how to buy online, welding rod is always not assured: If the special electrode used for maintenance, the use of special technology, and Wiodin (Tianjin) Welding Technology Co., Ltd. get in touch

Q: What is the difference between tin strip and electrode?: Tin bars are welded by welding iron, used in electronic products and welding electrodes, and used in Engineering (for example, construction, shipbuilding).

Q: When 507560 electrodes are used at the same time, which electrode should be selected?: 507 506 welding preferred 506. No 560 electrodes, this specification, model, brand.Brand: J506, model: E5016 belongs to low hydrogen and potassium alloy structural steel welding rod. AC welder (no-load voltage is not lower than 70V, machine load rate of not less than 60% of rated output current, welding welding not less than 300 Amperes) DC welder (reverse connection wire clamp is connected with the cathode electrode holder is connected with the anode -, +) polarity electrode. Good welding process. Non Q345 class boilers, containers, pipes and other special components; first choice should be J506 welding rod.Brand: J507, model: E5015 belongs to low hydrogen sodium type low alloy structural steel welding rod. The electrode does not contain arc stabilizer. Only reverse polarity welding shall be used. Suitable for welding Q345R, container, steel and other precision parts. Compared with J506, the deposited metal has lower porosity, slag inclusion, crack and so on. It shall not be used without DC welder.

Q: 304 generally use A102 welding rod,321 generally use A132 welding rod,Dissimilar steel A302 welding rod,May I ask if 304 can use A132 welding rod? Why?: 1, no, in addition to welding and to achieve the parent material and other strong mother, but sometimes need to consider the toughness of the weld zone, with high strength instead of reducing the performance of materials.2, A132 is a kind of Cr19Ni10Nb stainless steel welding rod containing Nb stabilizer. It has excellent intergranular corrosion resistance and good mechanical properties. With excellent welding process and anti porosity property, drug Pinai redness, anti cracking, but the ac-dc.3, 304 stainless steel is a common stainless steel material, the density of 7.93 g/cm3, the industry is also called 18/8 stainless steel. High temperature resistance of 800 degrees, with good processability, high toughness characteristics, widely used in industry and furniture decoration industry and food and medical industry. 304 is a versatile stainless steel which is widely used in the manufacture of equipment and parts requiring good overall performance (corrosion resistance and formability). In order to maintain the inherent corrosion resistance of stainless steel, steel must contain more than 18% chromium, more than 8% of the nickel content. 304 stainless steel is a brand of stainless steel produced according to the ASTM standard in the United states.

Q: In the pipe welding, a welding rod welding in the replacement of an electrode should be how to deal with joints?: 1, if the strict requirements for pipeline welding, portable welder hammer medicine skin clean, in a welding rod arc welding joint has less to stay in the rear has deposited metal (no more than a centimeter can) for a moment, a swing, further the welding slag burn surface welding quality;2, in large long-distance pipeline, welding joints must be cleaned with a sand turbine, and then the next step of welding.

Q: How many roots are there in a package of 2.5 electrodes?: Look how thick, 4 is 100, more than 2.5

Q: What electrode does Q235 use?: According to the classification of the characteristics of the slag after the electrode is melted, the welding electrode can be divided into an acid welding rod and an alkaline welding rod. The main component of acid electrode coating is acid oxide, such as Q235 low carbon steel. When welding important structural parts, E4315, E4316, E5015 and E5016 should be selected according to different welding conditions.Q235 is a carbon structural steel, which is equivalent to the A3 and C3 steel in the old standard GB700-79, and is used in the Russian TOCT brand. The grade Q represent in yield strength. Normally, the steel is not used directly after heat treatment.

Q: What kind of material is E4303 electrode?: E4303 electrode, it's made of carbon steel

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