Kobe Steel LB-52U low hydrogen welding electrode for high quality root pass, ideal for welding pipes and carbon steel in all positions with strong, neat and crack-resistant results.
AWS A5.1 E7016, EN ISO 2560-A-E 42 2 B, JIS Z3211 E4316
LB-52U welding electrode is a low hydrogen type welding electrode specifically designed for root pass welding on carbon steel pipes and structures with all-directional welding positions.
Its main advantage lies in its ability to produce deep penetration and a smooth, consistent root bead, even in joints with limited access.
LB-52U welding electrode is also known for its high arc stability, easy slag removal, and clean weld appearance without much spatter.
It is often chosen for critical welding jobs, such as in the oil, gas and petrochemical industries, as it guarantees joint strength and crack resistance under extreme conditions.
To ensure the selection of welding electrode according to material, thickness, position, and work standards, please see welding electrode guide according to project standards.
| Parameters | Description |
| Product Name | Welding Electrodes LB-52U |
| Brand | KOBELCO |
| Main Application | Welding electrode for 490 N/mm2 |
| Welding Electrode Size | 2.6 mm, 3.2 mm, 4.0 mm, 5.0 mm |
| Welding Process | SMAW |
| Weight Per Packaging | 20 Kg |
| Polarity | AC, DCEP |
The workability of welding electrodes LB-52U is excellent in 1G to 6G position welding, especially for root passes in pipe joints with narrow gaps.
This welding electrode electrode produces a stable, easy-to-control arc and creates deep penetration with a symmetrical and neat bead shape. The slag is easily peeled off without much effort, thus speeding up the work process.
Additionally, LB-52U welding electrode exhibits high resistance to porosity and cracking, making it a mainstay for structural welding in demanding work environments such as ship construction, power plants, and high-pressure pipeline installations.
| Melting Point (MPa/ksi) | Tensile Strength (MPa/ksi) | Elongation (%) | IV (J) |
|---|---|---|---|
| 480 (64) | 560 (79) | 32 | 80 |
| Melting Point (MPa/ksi) | Tensile Strength (MPa/ksi) | Elongation (%) | IV (J) |
|---|---|---|---|
| 400 (58) | 480 (70) | 22 | 27 |
| Ø mm | 1F, 1G, 2F, 2G | 3G (uphill), 4G | Root Pass (*) |
| 2.6 | 60~90 | 50~80 | 30~80 |
| 3.2 | 90~130 | 80~120 | 60~110 |
| 4.0 | 130~180 | 110~170 | 90~140 |
| 5.0 | 180~240 | 150~200 | 130~180 |
Note: (*) DCIN is also suitable.
| ABS | 3Y, MG, H10 |
| LR | 3Ym, MG, H15 |
| DNV | 3Y, H10 |
| BV | 3YH10 |
| NK (*) | KMW53, H10 |
| CCS | 3Y, H10 |
| NAKS | AWS A.51 E7016 |
Note: (*) AC
Composition (weld metal mass %)
| Chemistry Value | Typical | Guaranty* |
| C | 0.08 | 0.15 |
| Si | 0.64 | 0.75 |
| Mn | 0.86 | 1.60 |
| P | 0.012 | 0.035 |
| S | 0.008 | 0.035 |
| Ni | 0.01 | 0.30 |
| Cr | 0.02 | 0.20 |
| Mo | < 0.01 | 0.30 |
| V | 0.01 | 0.08 |
| Others (**) | 0.90 | 1.75 |
Notes :
(*) single value is maximum
(**) combined limit for Mn + Ni + Cr + Mo + V
| Diameter (mm) | Length (mm) | Weight per Pack (kg) | Weight per Carton (kg) |
|---|---|---|---|
| 2.6 | 350 | 5 | 20 |
| 3.2 | 400 | 5 | 20 |
| 4.0 | 400 | 5 | 20 |
| Diameter (mm) | Weight per Bar (g) | Carton Size (mm) |
|---|---|---|
| 2.6 | 20 | 170W × 110H × 380L |
| 3.2 | 35 | 170W × 110H × 430L |
| 4.0 | 53 | 170W × 110H × 430L |
KOBELCO LB-52U Usage Notes
Need LB-52U welding electrode for your pipeline project? Contact our team via WhatsApp now for a quick consultation, availability check, and the best offer.
KOBELCO LB-52U Welding Electrode FAQ
Electrode KOBELCO LB-52U used for welding of pipes, pressure vessels, high pressure tanks, and high strength steel structures which demands connection with high impact toughness and resistance to hydrogen crackingWith a more stable arc character, easy slag peeling, and very clean weld results, the LB-52U is the main choice for projects. pipeline, boiler, and heavy industrial construction which requires precision performance and maximum security.
The “LB” designation on KOBELCO welding rods stands for “Low-hydrogen Basic”, which describes an electrode flux type with very low hydrogen content and high basicity. This formulation helps reduce the risk of hydrogen cracking and produces joints with optimal strength and ductility. The LB series is widely recognized for its consistent quality for structural welding, industrial piping, and high-standard applications worldwide.
ISO 9001:2015
ISO 14001:2015
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