Ark Welding Covered Electrode

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Supply Capability:: 10000 Boxes per Month carton/month

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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: 12 chromium vanadium molybdenum with what electrode?: R312 welding rod or welding wire, model is E5503-B2-V,Or R317 electrode or wire, the model is E5515-B2-V.

Q: What welding rod is used for the welding of Q345 material?: Q345 is a kind of low alloy high strength structural steel with yield point 345MPa. It is recommended to use J507 welding rod.

Q: Requirements for welding electrodes for temperature and humidity: Storage should be kept at 10---25 degrees Celsius and less than 50% relative humidity.

Q: What does the number in the welding rod mean?: J422 is the name of this electrode...J422 welding electrode is common name, corresponding to international standard brand E4303. It is a kind of acid welding rod, the coating is made of titanium and calcium, and J stands for structural steel welding rod, and 42 is the tensile strength of 42kg/mm2 weld metal,2 application editorsMain application: low alloy steel used for welding low carbon steel structure and low strength grade. It is generally used for welding steel structure and welding of ordinary carbon steel pipe.SpecificationsJ422 welding rod diameter ranging from 2.5mm to 6.0mm, can be carried out in all position welding, AC and DC dual-use. With excellent welding process performance and mechanical properties, stable arc, less spatter, easy slag removal, beautiful weld formation

Q: Can plastic welding rod weld PVC?: It can be welded by heating weldingPVC as long as PVC, PVC is thermoplastic material, and can be welded with plastic welding rod.Can also be used without welding rod direct heating, with ultrasonic welding machine welding.

Q: What does 70 of the e7015 electrode mean?: The method of welding rod number is as follows: the welding rod letter "E" means welding rod;The top two digital said the minimum value of the tensile strength of the deposited metal is kgf/mm - unit. (70kgf/mm = - 690 MPa)Third digit electrode welding position, "0" and "1" electrode for all position welding (flat, vertical, horizontal, upward), "2" is suitable for welding and fillet welding electrodes, "4" is suitable for vertical down welding electrode;The third and fourth bit numbers indicate the type of weld current and the type of coating.After fourth digits, additional "R" is added to indicate the resistance to moisture absorbing electrode. Additional "M" is used to indicate the resistance to moisture absorption and mechanical properties. The electrode with special requirements is added with "-1", indicating that the electrode with special requirements for shock performance is attached.

Q: Why do welding electrodes need heating?: Prevent welding rod from wettingPreheat the cores, enhance electrode weldabilityIt's also a welding processThe electrode (covered electrode) welding or welding filler metal in melting joint welding of the workpiece.The electrode (coveredelectrode), is the metal coating in the welding core (coating), uniform centripetal pressure applied to core. The core metal cored electrode, in order to ensure the quality and performance of the weld, there are strict rules on the contents of metal elements in the core, especially for harmful impurities (such as sulfur, phosphorus content, etc.) should be strictly restricted, better than the base metal.

Q: What kind of welding rod should be used for welding cast iron? 506?: There is cast iron welding rod, 506 is medium carbon steel or low alloy steel welding rod

Q: Why stainless steel electrode is relatively short?: It has not been found that the length of stainless steel electrode is shorter than that of ordinary electrode. Maybe the specifications you bought are different.

Q: What is the difference between E4315 welding rod and E5016 electrode?: The main difference between E4315 welding rod and E5016 electrode is that E5016 welding rod is more expensive.E4315: the tensile strength of deposited metal is not less than 420MPa. It is suitable for all position welding, low hydrogen and sodium type, and direct current reverse connection;E5016: the tensile strength of deposited metal is not less than 490MPa. It is suitable for all position welding, low hydrogen and potassium type, AC or DC reverse connection.The chemical composition of both is ordinary low carbon steel, E5016 can be used instead of E4315.

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