Ark Welding Covered Electrode

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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.

 

CHARACTERISTICS

  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.

 

NOTE ON WELDING OPERATION

  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.

 

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

 

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Q:How should welding electrodes be selected?
Q:J422 electrodes are marked with "THJ422". What does TH represent?
J422 is the brand of welding rod GB. As for the TH is the enterprise stipulated grades, the first letter T should be on behalf of the welding electrode (strip of the first letter); second letters H, should be related to the electrode trademark or manufacturer's name.
Q:What kind of welding rod should be used for welding cast iron? 506?
Stainless steel electrode
Q:Does the welding rod have a shelf life?
Welding rod has shelf life,The quality index of storage time exceeds a certain time limit, changes in different degree of quality (metamorphic). Various types of electrodes are stored for a long time, and sometimes white crystals are found on the surface of the electrode. This is usually caused by water glass. Packing should be improved to prevent moisture absorption of welding rod and must be properly kept in storage. All kinds of welding rod are seriously deteriorated, and the batch of medicine is seriously falling off. The welding rod should be scrapped.
Q:What kind of welding rod is ECoCr-A?
Co based alloy surfacing electrode
Q:What type of welding rod is applied to Q345 steel plate?
Q345 steel plate is welded with J506 or J507 electrode.J506 is a low hydrogen potassium electrode, it is a kind of basic electrode, welding steel structure and the typical Q235, Q245R, Q345 steel, the tensile strength of E4315 is much larger relative to the common electrode, so the general welding force or by welding steel structure of dynamic load.J506 welding rod diameter ranging from 2.5mm to 6.0mm, can be carried out in all position welding, welding using alternative welding machine.The weld formation after J506 welding is more difficult than that of the acid welding rod. If an electrode is used on the cover of the steel structure, the acid electrode can be used.J507 is a low sodium hydrogen electrode, it is a kind of basic electrode, can be Q235, Q245R, Q345 typical welding structure steel in steel, the tensile strength of E4315 is much larger compared to the common electrode, so the general welding force or under dynamic load of steel structure.J507 welding rod diameter ranging from 2.5mm to 6.0mm, can be carried out in all position welding, welding using DC welder, polarity reversal. Of course, if there is only AC welder in the field, AC welder can be used, but the current needs to be switched on.The weld formation after J507 welding is more difficult than that of the acid welding rod. If an electrode is used on the cover of the steel structure, the acid electrode can be used.
Q:Does construction welding rod need to be re examined?
No, ask the supervisor? The main routine is to send the materials, such as welding flux, etc...
Q:What is the current of 2,6 electrode?
No (2.6 mm diameter) of the electrode specification.The most similar model is the electrode diameter 2.5 mm.The current range of welding is usually 50A~80A.Welding position is different, welding current is different.
Q:Why can't manual arc welding be performed with bare electrode?
The crust is intended to weld the pool over the metal, forming a skin to protect the molten pool from contact with air. If there is no medicine, the skin will protect the blowhole.
Q:H13 what kind of welding rod is used for steel welding?
H13 is because the hot die die, as far as possible without welding, such as welding and molding after then try to use the stainless steel welding rod or wire, if you need to have the strength of welding, preheating in the best welding preheating temperature between 500-600 degrees is appropriate, the good after welding with some insulation material covering. Such as asbestos, the slow cooling speed, reduce welding stress.Avoid soldering prior to heat treatment.
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