Kobe Steel Electrodes, Welding Electrodes, Welding, Kobe Steel

Kobe Steel Electrodes, Kawat Las, Elektroda, Kobe Steel, Welding.

Welding electrodes are metal wires with baked on chemical coatings. The rod is used to sustain the welding arc and to provide the filler metal required for the joint to be welded. The coating protects the metal from damage, stabilizes the arc, and improves the weld.

Kawat las atau yang sering disebut dengan elektroda adalah suatu material yang digunakan untuk melakukan pengelasan listrik yang berfungsi sebagai pembakar yang akan menimbulkan busur nyala untuk menyambung logam.

Kobelco Welding enters Bangladesh

 

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Description

1. Welding electrodes for carbon steel

a. RB-26

 

Applications
This is a high titania type of welding electrode for mild steel. It is widely used for welding sheets of ships, rolling stocks and automobiles, for ornamental surfacing of thick plates
Characteristics on usage

– RB-26 is a high titania type covered electrode which makes it possible to do vertical downward welding with diameters up to 5.0mm.
– The arc is stable with little spatter and lustrous bead can be obtained.
– RB-26 is most suitable for welding the structures, which need vertical downward welding in particular while it is suitable for welding steel sheets and light structures because of shallow penetration.
Notes on usage

– In the case of vertical downward welding, manipulate the electrode keeping its tip in contact with mother plate as shown in the sketch.
– Pay attention not to exceed the range of proper currents. Welding with excessive current not only lower X-ray soundness, but also causes increase of spatter, undercut and insufficient slag covering.
– Dry the electrodes at 70-100° C for 30-60 minutes before use. Excessive moisture absorption lower usability and may result in some porosities.

 

b. B-10

 

Applications
Shielded metal arc welding vehicles, building and other general structures made of mild steel. For all-position welding of general structures.
Characteristics on usage

– B-10 is an ilmenite type covered electrode, which is designed for better usability to be suitable for butt or fillet welding in all positions for thin or thicker plate (106 to 2.0mm) due to wide range of the electrode sizes.
– In particular, it is hard to cause slag inclusion and lustrous bead can be obtained due to stable slag covering in flat welding.
– The penetration is deeper compared with high titania and lime titania type electrodes.
– It is suitable for welding joint where better penetration is required even for a thin plate.
Notes on usage

– Pay attention not to exceed the range of proper currents. Welding with excessive current not only lower X-ray soundness, but also causes increase of spatter, undercut and insufficient slag covering.
– Dry the electrodes at 70-100° C for 30-60 minutes before use. Excessive moisture absorption lower usability and may result in some porosities.
– Excessive drying before use causes less penetration and overheating of the electrode.
– Medium or heavy thick plate should be welded under proper preheating and interpass temperatures.

 

c. B-14

 

Applications
Shielded metal arc welding of heavy-duty structures as ships, vehicles, buildings and bridges made of mild steel. For all-position welding of heavy-duty structures.
Characteristics on usage

– B-14 is an ilmenite type covered electrode designed for better usability and weld ability. It is suitable for butt or fillet welding in all positions for thin or thicker plate (1.6 to 2.0mm).
– In horizontal fillet welding, slag covering and bead uniformity are good and bead appearance is beautiful.
– Its usability in vertical or overhead welding is best among ilmenite type electrodes.
– Due to good X-ray soundness and mechanical properties, B-14 is used for skill testing and competition by choice.
Notes on usage

– Pay attention not to exceed the range of proper currents. Welding with excessive current not only lower X-ray soundness, but also causes increase of spatter, undercut and insufficient slag covering.
– Dry the electrodes at 70-100° C for 30-60 minutes before use. Excessive moisture absorption lower usability and may result in some porosities.
– Excessive drying before use causes less penetration and overheating of the electrode.
– Medium or heavy thick plate should be welded under proper preheating and interpass temperature.

 

d. B-17

 

Applications
Shielded metal arc welding of heavy-duty structures such as ships, buildings, and machinery made of mild steel. For all-position welding of heavy-duty structures.
Characteristics on usage

– B-17 is an ilmenite type covered electrode, which is designed for better weld ability in particular.
– As its crack resistibility, porosity resistibility and X-ray soundness are excellent among ilmenite type electrodes, structural steels with heavy sections up to 20mm cab be welded with B-17.
– B-17 has been used in the various fields due to its higher reliability since 1942 when it was developed.
Notes on usage

– Pay attention not to exceed the range of proper currents. Welding with excessive current not only lower X-ray soundness, but also causes increase of spatter, undercut and insufficient slag covering.
– Dry the electrodes at 70-100° C for 30-60 minutes before use. Excessive moisture absorption lower usability and may result in some porosities.
– Excessive drying before use causes less penetration and overheating of the electrode.
– Medium or heavy thick plate should be welded under proper preheating and interpass temperature.

 

e. LB-26

 

Applications
Shielded metal arc welding of general heavy structural steels for ships, buildings, bridges and pressure vessels made of mild steel. For welding of heavy-duty structures and heavy plates.
Characteristics on usage

– LB-26 is a low hydrogen type covered electrode containing iron powder in its coating so that the welding efficiency can be improved.
– The weld metal provides good X-ray soundness and mechanical properties.
– The welding in all positions can be easily done with the good usability of stable arc, good slag removability and good bead appearance.
Notes on usage

– Dry the electrodes at 300-350°C for 30-60 minutes before use.
– Take the back step method or strike the arc on a small steel plate prepared to prevent blowholes at the arc starting.
– Keep the arc as short as possible.

2. Welding electrodes for 490 N/mm2 high-tensile steel

a. LB-52

 

Applications
Shielded metal arc welding of mild and 490N/mm² high tensile steels in ships, bridges, buildings and pressure vessels.
Characteristics on usage

– LB-52 is the most widely used low hydrogen type covered electrode for all-position welding of 490N/mm² high tensile steel.
– X-ray soundness and mechanical properties of the weld metal are excellent.
– The usability such as arc smoothness, slag removal and bead appearance are good.
Notes on usage

– Dry the electrodes at 300-350°C for 30-60 minutes before use.
– Take the back step method or strike the arc on a small steel plate prepared for this particular purpose to prevent blowholes at the arc starting.
– Keep the arc as short as possible.

 

b. LB-52-18

 

Applications
Shielded metal arc welding of mild and 490N/mm² high tensile steels of ships, bridges, buildings and pressure vessels. For welding of 490N/mm² high tensile steel.
Characteristics on usage

– LB-52-18 is an iron powder low hydrogen type covered electrode for all position welding.
– The mechanical properties of the weld metal are the same as LB-52.
– Its usability by direct current is the best among low hydrogen type electrodes.
Notes on usage

– Dry the electrodes at 300-350°C for 30-60 minutes before use.
– Take the back step method or strike the arc on a small steel plate prepared for this particular purpose to prevent blowholes at the arc starting.
– Keep the arc as short as possible.

 

c. LB-52U

 

Applications
One-side shielded metal arc welding of pipes and general butt joints of mild steel and 490N/mm² high tensile steel. For one-side welding.
Characteristics on usage

– LB-52U is a low hydrogen type covered electrode for exclusive use for one side welding of pipes and general structures.
– Its arc stability is extremely good to perform one-side welding with relatively low currents.
– LB-52U provides good slag removability and smooth weld beads.
Notes on usage

– Dry the electrodes at 300-350°C for 30-60 minutes before use.
– Reverse side bead with good appearance is obtained with proper current and optimum root gap.
– Cut off the arc after setting the crater to the sidewall of the groove to avoid crater cracks.
– Strike the arc on a small steel plate prepared for this purpose or on the sidewall of the groove to prevent blowholes at the arc starting.
– Keep the arc as short as possible.

3. High cellulose-type electrodes

KOBE-6010

 

Applications and Features

– A high cellulose type electrode for API grades up to X52 steels on DC current only.
– Suitable for all-position welding of pipes and general structures including vertical downward position.
– Weld penetrations deeper, less slag makes welding manipulation easier, porosities are not easily formed, and X-ray soundness is better.

4. Welding electrodes for stainless steel

a. NC-38

 

Applications
Shielded metal arc welding of 18%Cr-8%Ni stainless steel such as SUS 304.
Characteristics on usage

– NC-38 and HIMELT-308 are lime-titania type electrodes, and HIMELT-308 makes higher welding efficiency by higher amperage.
– As these electrodes deposit austenitic weld metals, which contain suitable quantity of ferrite, weld ability is especially excellent with better crack resistibility.
– Furthermore, heat resistibility, corrosion resistibility, and mechanical properties are good in the as-welded condition.

 

b. NC-38L

 

Applications
Shielded metal arc welding of low carbon 18%Cr-8%Ni stainless steel such as SUS 304L.
Characteristics on usage

– NC-38L and HIMELT-308L are lime-titania type electrodes, and HIMELT-908L makes higher welding efficiency by higher amperage.
– As the weld metals make low carbon austenitic structure, which contains suitable quantity of ferrite, crack resistibility, is god and intergranular corrosion resistibility is superior to that of NC-38 and HIMELT-308.
– In the as-welded conditions the weld metals provide good corrosion resistibility and good mechanical properties.

 

c. NC-39

 

Applications

– Shielded metal arc welding of 22%Cr-12%Ni steel such as SUS309S.
– Welding of dissimilar metals such as stainless steel and carbon steel or low alloy steel.
Characteristics on usage

– NC-39 and HIMELT-309 are lime-titania type electrodes, and HIMELT-309 makes higher welding efficiency by higher amperage.
– As the weld metals contain larger quantity of ferrite in austenitic structure, the weld ability is good and they provide good corrosion resistibility and good heat resistibility in as-welded condition.
– As the weld metals contain much quantity of alloying elements and have stable austenitic structure, they are suitable where the dilution by a base metal of carbon steel or low alloy steel is considerable.

 

d. NC-39L

 

Applications

– Shielded metal arc welding of dissimilar metals such as stainless steel to carbon steel or low alloy steel.
– Under layer welding of the cladded side groove of SUS304L clad steel, or of 308L weld overlaying onto carbon steel or low alloy steel.
Characteristics on usage

– NC-39L and HIMELT-309L are lime-titania type electrodes, and HIMELT-309L makes higher efficiency by higher amperage.
– As the weld metals contain larger quantity of ferrite in austenitic structure, the weld ability is good.
– They provide good corrosion resistibility and good heat resistibility in as-welded condition.
– They are suitable where the dilution by base metal carbon steel or low alloy steel is considerable.

 

e. NC-36

 

Applications
Shielded metal arc welding of 18%Cr-12%Ni-2%Mo stainless steel such as SUS316.
Characteristics on usage

– NC-36 and HIMELT-316 are lime-titania type electrodes, and HIMELT-316 makes higher welding efficiency by higher amperage.
– As the weld metals contain proper quantity of ferrite in austenitic structure, the crack resistibility is excellent.
– Especially the corrosion resistance against diluted sulfuric acid is excellent.
– The mechanical properties of the weld metals at elevated temperatures are superior to NC-38.
– Heat resistibility and corrosion resistibility of the weld metals are excellent in as-welded condition.

 

f. NC-36L

 

Applications
Shielded metal arc welding of low carbon 18%Cr-12%Ni-2%Mo stainless steel such as SUS316L.
Characteristics on usage

– NC-36L and HIMELT-316L are lime-titania type electrodes, and HIMELT-316L makes higher welding efficiency by higher amperage.
– As the weld metals contain proper quantity of ferrite in austenitic structure, the crack resistibility is excellent.
– The intergranular corrosion resistibility us superior to that of NC-36 and HIMELT-316L, due to lower carbon content.

5. Welding electrodes for cast iron

CIA-1, CIA-2, CIA-3

 

 

Applications
Shielded metal arc welding for repairing and joining various kinds of cast irons. For welding of cast irons.
Characteristics on usage

CIA-1
– A covered electrode with graphite type coating flux and pure nickel core rod.
– Least hardening of the weld metal and the heat affected zone of cast iron is obtained with CIA-1.
– Therefore, it has excellent weld ability and machinability.
CIA-2
– A covered electrode with graphite type coating flux and 55%Ni-Fe alloy core rod.
– The hardening of the weld metal is less than CIA-3, and crack resistibility is excellent.
CIA-3
– A low hydrogen type electrode with pure iron core rod.
– The hardening of the weld is larger than CIA-1 and CIA-2, so it is suitable where post-weld machining is not needed.

6. Welding electrodes for hard-surfacing

a. HF-350

 

Applications
Hard surfacing of upper rollers and sprockets of bulldozers. For metal-to-metal wearing.
Characteristics on usage

– HF-350 is electrode for metal-to-metal wearing whose hardness and toughness are well balanced.
– It is also applicable to abrasion accompanied by moderate impact.
– Machining the weld metal is applicable, and the hardness can be increased by quenching after machining.
Notes on usage

– Preheating is unnecessary in general. However, large size casting steels and forgings, low alloy steels, or high carbon steels should be preheated at 150°C and higher temperatures on hard surfacing.
– As the machining may be difficult due to hardening in the case of high cooling speed, apply the preheating or immediate post weld heating.

 

b. HF-500

 

Applications
Hard surfacing of idlers and trucks links of bulldozers. For metal-to-metal wearing and light abrasions.
Characteristics on usage

– HF-500 deposits the weld metal of martensite structure, which has good toughness.
– It is applicable to severe metal-to-metal wearing and abrasion accompanied by light impact.
– It is difficult to apply machining on the weld metal.
Notes on usage

– Preheat at 150°C and over in general.
– In the case of multi-layer hard surfacing or hard surfacing onto large size casting steels and forgings, low alloy steels, or high carbon steels, under layer welding with low hydrogen type electrodes for mild steel should be applied.

 

c. HF-600

 

Applications
Hard surfacing of lower rollers and buckets edges. For metal-to-metal wearing and abrasions.
Characteristics on usage

– HF-600 is an electrode depositing weld metal of martensite structure.
– It is applicable to abrasion accompanied by light impact. It is difficult to apply machining under the as-welded condition.
Notes on usage

– Preheat 200°C over in general.
– In the case of multi–layer hard surfacing or hard surfacing onto large size casting steels and forgings, low alloy steels, or high carbon steels, under-layer welding should be applied with low hydrogen type electrodes for mild steel.

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