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Stainless Steel Electrodes

307

Descriptions
307 Stainless steel

Characteristics
This electrode is specially formulated to weld at low amperage to ensure minimum distortion. The 307 has good ignition and re-ignition properties, good slag removal and minimal loss through spatter. The high recovery rate of 180% ensures fast deposition with a minimum dilution of the base metal.

Applications
307 is used on crossing and points, gears, hot dies, rolls, valves, shafts, gear-teeth, machine parts and heavily loaded welds. Because of its high heat resistant properties, it is ideal as a buffer layer prior to hot working hard-facing applications.

Procedures
Keep the arc short to medium. DO not weave more than three times the diameter of the electrode. Pre-heat up to 250 degrees on steels with poor weldability. Pre-heating is not required for other steels. Always use dry electrodes.

Redrying
Should electrodes become moist re-dry at 350° C for 1 hour

308

Characteristics
308L permits welding at the lowest possible amperage in flat, vertical, horizontal or
overhead positions Deposition is fast and smooth with low spatter and good slag detach-ability.

Applications
Use for joining or cladding of 18-8 chrome nickel stainless steel requiring similar deposit
as the base metal. Ideal for steel types 301, 302, 304, 305, 308, 321, 347.

Procedures
To avoid heat accumulation, keep a short arc and use low amperage with stringer bead technique.
Remove the slag after each pass. On DC equipment use positive polarity. On long seams, tack at
short intervals to reduce distortion

Redrying
Should electrodes become moist re-dry at 350°C for 1 hour

308H

Descriptions
308H is a rutile basic all position stainless steel electrode, Specially developed for high temperature applications like industrial furnaces(ovens).
High resistance to oxidation up to 1050°C. Weldable on AC and DC.

Characteristics
308H features low spatter loss and excellent slag removal. The work surface is smooth and finish free of undercut. The electrode is free from porosity.

Procedures
To avoid heat accumulation, use low amperage with stringer bead technique. Hold a short arc and remove slag after each pass. On Dc equipment use positive polarity.

Redrying
If moist re-dry at 350°C for 1 hour

309

Characteristics
Features low spatter loss and excellent slag removal. The work surface is smooth and finish free of undercut. The electrode is free from porosity.

Applications
Highly alloyed low carbon electrode designed for the dissimilar welding of stainless steel to mild steel or low-alloy steels. It is also well suited for buffer layers when overlay welding on mild steel, giving an 18Cr 8Ni deposit already in the first layer. It can also be used for welding high temperature steels.

Procedures
To avoid heat accumulation, use low amperage with stringer bead technique. Hold a short arc and remove the slag after each pass. On DC Equipment use positive polarity.

Redrying
If moist re-dry at 350deg C for 1 hour.

309-LMO

Characteristics
Features low-spatter loss and excellent slag removal. The work surface is smooth and finish free of undercut. The electrode is free from porosity.

Applications
This is a molybdenum-alloyed electrode of the 309LMo type, which is primarily designed for joining or cladding Stainless Steels of similar and dissimilar compositions. Also for joining and cladding non-alloy or low-alloy steel to obtain corrosion or heat resistance. Use on steel types 304-308L, 3Cr12, 309L, 321, 347, 316L, 318.When used for surfacing, the composition obtained is more or less equal to that of astm 316 from the very first run.

Procedures
To avoid heat accumulation, use low amperage with stringer bead technique. Hold a short arc and remove slag after each pass. On DC equipment use positive polarity.

Redrying
Should electrodes become moist re-dry at 350°C for 1 hour

310

Characteristics
310 gives a smooth flow and easy slag removal at low amperages. The weld deposit is finely rippled. For porosity free welds, use dry electrodes.

Applications
In addition to its heat and scaling resistance, 310 also gives good toughness at sub-zero temperatures as occur in gas reducing plants. The electrodes are widely used on furnace lining, grates, burners, heat exchangers, pipework and fittings.

Procedures
To avoid heat accumulation, keep the arc s short as possible and use low amperage with stringer bead technique. Remove the slag after each pass. On DC equipment use positive polarity.

Redrying
Should electrodes become moist re-dry at 350° C for 1 hour

316

Characteristics
This electrode is characterised by a steady arc with very little spatter, high welding speed and easy slag removal. It produces a smooth concave weld surface in a horizontal fillet weld, which improves the resistance to fatigue. A flat weld surface is obtained in butt welds and this reduces grinding costs.316L is used for welding austenitic Cr-Ni-Mo steels of the ASTM 316 and 316L types. It can also be used for welding niobium and titanium stabilised steels, such as ASTM 316Ti and 316Nb in cases where the welded component will be operating at temperatures not exceeding 400°C. For higher temperatures a stabilised welding consumable should be used such as 

Applications
316L is suitable as a buffer layer for hardfacing applications. It is widely used throughout the paper, chemical, fertilizer dairy, distillery and construction industries. Ideal for steel types 303, 304, 316, 317, 318, 321, 329. Corrosion resistance: is excellent for  general, pitting and intercrystalline corrosion in chloride containing environments. Intended for severe service conditions, e.g. in dilute hot acids 


Procedures
316L should be welded using a short arc or with its coating sliding along the workpiece. Direct current (positive polarity) is preferable. The best result is achieved by using an amperage in the upper part of the amperage range given, i.e. slightly higher than the amperage generally used for other electrode types. To ensure good penetration it is often advantageous to tack weld with a somewhat larger gap than that used when welding with rutile and basic electrodes..

Redrying
Should electrodes become moist re-dry at 350° C for 1 hour

347

Descriptions
347 is primarily intended for high temperature service or application that should be heat treated. However the corrosion resistance corresponds to that of 308H, i.e good resistance to general corrosion. Electrode for welding stabilized austenitic stainless steels such as AISI 347 and 321

Applications
347 can be used for cladding ,which normally requires stress relieving at around 590°C, Such heat treatment will lower ductility at room temperature. Always consult expertise before performing post-weld heat treatment.

Redrying
If moist re-dry at 300°C for 2 hours.

2209

Characteristics
2209 is a rutile flux coated electrode which deposits a 24%Cr, 10%Ni,3%Mo, 0.014%N duplex stainless steel weld metal having a ferrite content of about Fn30

Applications
2209 is designed for welding similar composition duplex stainless steels which offer an excellent combination of high strength and very good resistance to chloride induced pitting or stress corrosion cracking. Applications include offshore platform work, pipework, pipelines process vessels for chloride environments.

Procedures
Avoid excessive amperage, and use AC or DC straight polarity. Maintain a short arc and use stringer bead or weaving technique. To maintain the good properties of a duplex steel it is of the utmost importance to have a good ferrite content in the weld. Make sure the root gap is sufficient to ensure good penetration. Deformation during welding is a lot less than standard grades of stainless steel

Redrying
Should electrodes become moist re-dry at 300° C for 1 hour.