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:Hand welding electrodes 3.2 and 4 which are more commonly used?: Personally think 3.2 is more commonly used.The welding between the sheet metal parts, the weld is not big, 4-5mm, 3.2 of the running better.For wider welds, 4 is recommended;

Q:What brand of welding rod or welding wire for Q345B material?: Q345 steel is made of E50 type electrode (GB-T5118). For low strength steel and high strength steel, welding rod should be used to match low strength steel.The welding wire is not 506. This brand is ER50-6 copper plated solid welding wire.The tensile strength of the welding wire belongs to the E50 series, and the strength of the electrode with E5003 E5015 E5016 has been constant.Q345B belongs to low alloy steel. Aka: 16Mn.ER50-6 wire, coinciding with Q345 (B) strength, has been. You can use it safely.The tensile strength of ER50-6 welds is higher than that of E5015 E5016 welding electrodes. Solid two seam welding with minimum hydrogen content.

Q:What is the welding process of duplex stainless steel 2507? What electrode?: The brand of welding rod is: 2209. The electrode must be dried before welding. The drying process is 2 hours at 250 C, and the welding rod must be insulated with electrode.

Q:How big is the maximum electrode and how big is the minimum electrode?!: Welding rod by diameter: Max 5MM840, minimum 2MM.

Q:What are the diameters of the electrodes?: The common diameter is 2.5, 3.24 (mm), also has 2mm, 5mm, generally not commonly used, very rare.

Q:What is the cause of partial magnetic blow?: Equal distances are provided with double ground wires or multiple ground wires.

Q:Don't long winded, concise, thank you!: First, the ordinary electrode is arc welding, is the direct consumption of materials in welding, is to rely on the skin to melt molten steel, not to be oxidized welding. Is the use of tungsten electrode argon arc welding, tungsten materials, prevent oxidation in protecting gas under high temperature, using current tungsten electrode welding wire and the material will be melted, the theory of tungsten consumption is minimal.Two and two kinds of materials are two kinds of welding methods. The arc welding is made with an electric welding rod, while the tungsten electrode is used in argon arc welding, but the tungsten electrode is only the electrode. The arc welding and the welding electrode act the same as the welding wire.

Q:Welding rod heat preservation barrel should be clamped in the welding machine: The wire end can be used with the insertion of the electrode insulation barrel insulation barrel, the other end two clips are respectively clamped in a quick connector holder, on the ground. The above is nonsense, since you ask, I estimate you are far away from the welding operation machine, can not be used with a wire insulation barrel. There are two solutions: 1. the insulation barrel comes with wire clip extension cord is cut off; 2. comes with a wire end clamp bare wire in wire, welding tongs plastic handle truncated, the wire clip in the wire holder. In short, to form the current loop can be.

Q:What type of welding rod is used for welding 16MnD?: 16MnD read as low as sixteen mn. Belong to sixteen Mn low temperature steel.Can useBrand: J507FeNi (model: E5018-G) basic electrode welding.The electrode belongs to a low hydrogen and sodium alloy structure steel powder welding rod. DC reverse connection. All position welding.It has good low temperature impact toughness. Used for welding of medium carbon steel and low temperature steel pressure vessel. Such as:16MnD, 16MnDR, etc..

Q:How long is the effective period of welding rod?: If the stock period exceeds the prescribed time limit, the electrode, flux and flux cored wire must be re examined before the relevant functional departments can be issued and used. complexTest principle to check whether the welding material may affect the quality defects, generally limited to appearance and process performance test, but there are doubts on the performance of welding materials, can increase the necessary inspection item.The prescribed time limit may be determined by the following method from the date of production:A) the period of recommendation for welding materials, quality certificates or manuals;B) a low hydrogen type welding material for acid welding materials and moisture resistant packages, sealed for two years;C) graphite type welding materials and other welding materials for one year.

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