Welding Flux Used in Submerged Processing - SJ301 (AWS F6A0-EL12)
It can be used in single-pass and multi-pass submerged arc welding for carbon steel and low-alloy structural steels with appropriate wires such as EL12, EM12, EM12K, etc.
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Type: TH·SJ301 is a Calcium-Silicon type flux.
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Grain Size: 2.0mm-0.3mm (10-60 mesh) or 2.0mm-0.45mm (10-40 mesh).
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Basicity: The basicity is approximately 1.0.
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Capability: Suitable for welding steel with slightly rusty or dirty surfaces, specifically optimized for girth welding of small pipelines.
1.
Re-drying: Before using, the flux shall be re-dried for 2 hours at 300℃-350℃.
2.
Preparation: Removing rust, oil, water, and other impurities in the weld zone is highly suggested before welding.
3.
Heat Input: Mechanical properties are decided by heat input; typically, small heat input yields better results than larger ones.
Mechanical Properties of All Weld Metal (TH·SJ301/THM-43)
| Items |
Rm/MPa |
Rel/Rp0.2 /MPa |
A% |
KV2 (-20℃) /J |
| Requirement |
430-600 |
≥330 |
≥20 |
≥27 |
| Typical Results |
460 |
375 |
28 |
80 |
Physical and Chemical Properties of Flux
| Items |
S (%) |
P (%) |
Moisture content (%) |
Mechanical inclusion (%) |
| Requirement |
≤0.060 |
≤0.080 |
≤0.10 |
≤0.30 |
| Typical Results |
0.030 |
0.028 |
0.01 |
0.1 |
Frequently Asked Questions
Q: What type of welding flux is SJ301?
A: SJ301 is a Calcium-Silicon type submerged arc welding flux with a basicity of approximately 1.0.
Q: Does SJ301 flux require pre-drying?
A: Yes, it is recommended to re-dry the flux at 300℃-350℃ for 2 hours before use to ensure optimal performance.
Q: Can I use SJ301 on surfaces with rust?
A: Yes, SJ301 is specifically designed to handle surfaces that have small amounts of rust or dirt, making it ideal for girth welding of small pipelines.
Q: Which welding wires are compatible with SJ301?
A: It is compatible with carbon steel and low-alloy structural steel wires such as EL12, EM12, and EM12K.
Q: How does heat input affect the welding result?
A: The mechanical properties of the weld metal are significantly influenced by heat input. Generally, smaller heat input produces better results than larger heat input.
Q: What is the typical grain size of SJ301?
A: The grain size is typically between 2.0mm-0.3mm (10-60 mesh) or 2.0mm-0.45mm (10-40 mesh).
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