Although both Submerged Arc Welding (SAW) and Arc Welding (ERW / HFW) are welding technologies, they have their own advantages in terms of process characteristics and application fields, demonstrating the diversity and continuous progress of welding technology.
1. Differences in process principles
Arc welding (ERW / HFW) is a type of welding method that uses the high temperature generated by the arc to melt and combine metals, and common ones include manual arc welding (SMAW) and gas shielded arc welding (GMAW). During welding, the arc is exposed to air, and the welder controls the welding process by operating a handheld welding rod or torch.
In SAW, the arc is covered with a layer of flux above the soldering area, and the arc is "sunk" by this layer of powder substance and is not directly exposed to air. This not only protects the weld from air pollution but also stabilizes the arc, improving weld quality and efficiency.
2. Welding Environment and Protection Methods
Arc welding is generally operated with gas protection or manually, and the welding area is exposed, and welders need to wear appropriate protective equipment to ensure safety.
Submerged Arc Welding uses a thick layer of flux for protection, which reduces the impact of harmful arc light on the operator, and at the same time, the atmosphere in the weld area is stable, which is more suitable for automated and mechanized operations.
3. Universal arc welding (ERW / HFW) : Flexible adaptation, unlimited scenarios
The core advantages focus on operational flexibility and scenario adaptability, making it an irreplaceable basic welding process in industrial production, especially suitable for on-site construction:
- Full-position welding: It can be operated in complex positions such as vertical, horizontal, and upside welding, and is suitable for the welding of special-shaped parts such as pressure vessel heads, steel pipe elbows, and steel structure nodes.
- Portable equipment: The welding machine is small in size and light in weight, and can be moved to on-site/outdoor construction without fixed stations.
- Real-time adjustment: The arc is visible, and the parameters/operations can be adjusted manually according to the weld pool state, adapting to small batches and multi-specification products;
- Low-cost entry: low equipment procurement/maintenance costs, more flexible and easy training for operator skill requirements (compared to submerged arc welding);
- No flux consumption: no flux / slag recovery, suitable for fast soldering of small and thin parts.
4. Submerged Arc Welding (SAW): Highly Efficient, Stable, and Top-Quality
The core advantages are efficiency, quality, and consistency, making it the optimal choice for welding large-scale, standardized thick-walled components, fully suited for industrial assembly line production:
- Extremely high welding efficiency: High current + automatic wire feed, with deposition rates 10–40 times higher than manual arc welding, significantly reducing welding time for thick-walled steel pipes/plates;
- Excellent weld quality: Dual protection from flux and gas, stable arc, very low defect rates such as porosity, slag inclusion, and cracks, resulting in high internal weld integrity;
- Perfect consistency in formation: Once parameters are preset, no manual intervention is needed, with uniform weld reinforcement, bead width, and penetration depth, reducing or eliminating extensive post-grinding;
- No spatter, low smoke: Clean working environment, reduces environmental handling costs, and prevents material waste caused by spatter;
- Suitable for thick-walled components: Capable of large groove multi-pass welding in a single run, with deep weld penetration (single pass penetration can reach over 20mm), ideal for thick-walled pressure steel pipes, large steel structures, ship decks, etc.;
- Strong automation compatibility: Can be integrated with robots and assembly lines for unmanned production, suitable for high-volume, standardized products (such as EN 10217 series large-diameter SAW steel pipes).
In summary, Submerged Arc Welding (SAW)and traditional arc welding (ERW / HFW) have their own characteristics and advantages, and jointly promote the development of modern manufacturing. The two complement each other, providing diverse solutions for different production needs, demonstrating the bright prospects of continuous innovation and improvement in welding technology. No matter which welding method is chosen, it carries the unremitting pursuit of quality and efficiency by workers, helping the industry move towards a more brilliant tomorrow.
