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:Why can not welding machine welding electrode spark?
The size of the spark is related to the matching of current and voltage. The general matching formula is V=14+0.05A. When the voltage is 4, the electrode selection is reasonable, how do you do the above?. Is that correct? The welder is not in size
Q:Why is the electrode almost finished? Each time there is a little left?
There is no limit, but the weldment is different, the length of the weld is also different, if a bead with 35 length, welding rod can fill slowly, that will naturally leave a section, as for other reasons is the operator's habits are different
Q:Difference between J422 welding rod and J502 welding rod
Their strength is different, J422 is 42 kg class, J502 is 50 kg class, steel model I don't understand. J502 welding thread steel is appropriate.
Q:What kind of welding rod is used for Q345R steel plate welding?
Q345R is an ordinary low alloy steel. It is commonly used in boiler and pressure vessel. The delivery status is hot or normalized, low alloy steel. The performance is similar to that of Q345 (16Mn) (the yield strength of 16mm steel plate is greater than 345Mpa), the tensile strength is (510-640), the elongation is greater than 21%, and the impact strength of zero V is greater than 34J. E5015 calcium electrode is recommended.
Q:How can I distinguish the basic electrode or the acid welding electrode from the welding rod number?
The number of electrodes from 0 to 6 is acidic, and 7 to 9 is alkaline
Q:What is the difference between THJ506 welding rod and THJ422 electrode?
1, THJ506 electrode and THJ422 electrode in use is different.2, first of all, an acid welding rod, and an alkaline electrode.3, second electrode class is not the same, one is 40, one is 50.4, in the use of acid welding rod, DC welding machine can be welded.5, the basic welding rod welding machine is usually required to welding, because it requires welding machine no-load voltage is relatively high.6, THJ506 electrode in the description, it is possible to AC welding machine can be used, but in actual use, arc is very difficult, and even welding machine is not good, even the arc can not play, even if the arc, continuous welding is still very difficult.
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:Is it possible to use an AC welder for 506 electrodes?
AC and DC can be, a large current bar on the line
Q:What kind of welding rod is ECoCr-A?
D802 cobalt based electrode
Q:What are the requirements of steel structure for electrode?
E43 series welding rod for common steel structure Q235Q345 material of steel to use E50 series welding rodWelding between Q235 and Q345 steels requires the use of E43 series electrodes
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