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: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.That's all.

Q:Add 100 points to the approved answer before 2, plus 50 at 3. Beg speed: E5015 welding rod, also known as J507, J strip structure steel electrode. It belongs to low hydrogen sodium basic electrode. E stands for welding rod, and 50 represents tensile strength 50kgf/ mm215 represents low hydrogen and sodium type, suitable for all position welding of flat, horizontal, vertical and vertical positions. DC reverse welding is adopted.G507, the welding rod does not have this model.

Q:Electric welding machine welding, welding rod old stick metal, welding rod burning red, very scary: Several heroes are very practical, welding electrode drying before use is also necessary!

Q:This question has been answered, but the answer is not consistent with the proposed problem, I want to ask is how long after the use of suitable electrode, can not damage the electrode holder, but also save, thank you!: Don't want to damage and save the electrode, the electrode holder, you get 40mm on the line, mainly to see your operating

Q:Question Q235 weldability of carbon steel. What are the welding characteristics of those electrodes?: Q235 belongs to low carbon structural steel. Better welding process. The following welding electrodes can be used:1: Brand: J422, model: E4303 titanium calcium type low carbon structural steel welding rod. (acid electrode, AC and DC).2: Brand: J426, model: E4316, low hydrogen and low carbon structural steel welding rod. (basic electrode, AC and DC).3: Brand: J427, model: E4315 low hydrogen sodium type low carbon structural steel welding rod. Basic electrode. DC reverse connection).

Q:Mainly the advantages and disadvantages of J502 welding rod performance, as well as the development status at home and abroad,: 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 kind of welding rod does 1Cr13 steel plate use?: If used in high temperature situations, G202, but welding is troublesome, preheating before welding, heat treatment after welding, heat treatment should be carried out. If it is not high temperature occasions, A402 austenitic electrode is best. Preheating, welding, heat treatment, heat treatment are not necessary before welding.

Q:What grade of welding rod is used for three grade steel welding?: The type and quality control requirements of welded joints are shown in the welding procedure for reinforcing barsAccording to the form of welded joints: E5003, E5503 and so on.

Q:J807 electrode specification: Simply stated, the tensile strength grade is a low hydrogen sodium structural steel electrode at a rate of 800 kg per square millimeter! Mainly used for welding of steel of the same strength grade! Generally used for low carbon quenched and tempered steel welding!

Q:What is the substance on the outside of the electrode?: The electrode coating consists of various minerals, such as iron alloy, organic substance, water glass and other raw materials.Composition of electrode according to their different functions can be divided into arc stabilizing agent, fluxing agent, gas forming agent, deoxidizing agent and alloy slag agent, dilute agent and binder etc..

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