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- E 312
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stainless steel Welding Electrode E BK 312
The Stainless Steel welding electrode is SMAW Stick Electrode. Special alloy for welding and difficult to weld steel. A versatile super-strength stainless steel Electrode is to be considered a problem solver for all kinds of steel grades including stainless and difficult to weld steel and unknown steel. Croni 29/9 has a nominal composition (wt.-%) of 30 Cr, 9 Ni. These electrodes have been found valuable in welding dissimilar metals, especially when one of the base metals is a stainless steel high in nickel.
Applications
Welding Difficult to Weld steel, Harden able tools, Manganese steel, Spring Steels, High speed tool steel, High temperature steels, Dissimilar joints between stainless and high carbon steel and unknown steels, Suitable for problematic steels with higher strength such as pressing dies, trimming tools and armor plates. . Varied application in repair and maintenance of machines, shafts, gearwheels, especially in the field of building machinery. Also excellent for buffer layers before Hardfacing and for dissimilar welding between steel, stainless steels or unknown steels.
Classification
AWS
A 5.11: E NiCrFe-3 F-No. 43
EN ISO
3581-A: E 29 9 R 12 FM5
DIN
8556: E 29 9 R 23Typical Weld Metal Analysis %
| C | Mn | Cr | Ni |
| 0.10% | 0.8-1.2% | 28-30% | 8-10% |
Mechanical Properties (As Welded)
| RP0,2
(N/mm2) |
Rm
(N/mm2) |
A
(%) |
Impact Energy +20°C -196°C |
| 650 | >790 |
>24 |
>30 >70 |
General Information
Welding process
Covered Electrode (SMAW)
Alloy Type
High alloyed steel
Re-drying Temperature
300°C/2hours
Welding Position
All, except vertical down.
.
Cleaning
Remove all cracks and fatigued metal by grinding.
Welding Parameters
| Diameter & Length (mm) |
Current (A) |
| 2.5x300 |
70~80 |
| 3.2x300 |
90~120 |
| 4.0x350 |
120~150 |
Instruction:
Electrode to be held perpendicular to the workpiece;
Preheating is necessary when joining high carbon steel ( 150 -250°C).
keep a short arc: Allow the welded area to cool down slowly.