Protaweld® S200 is a sodium alginate polymer used as a binder to produce welding rod coatings that have excellent homogeneity and performance.
Protaweld® S200 is an alginate polymer designed to create high-quality coatings for welding electrodes. Typically added between 0.5–2.0 wt%, it is useful in optimizing welding rod manufacturing from start to finish, beginning with the coverage paste and finishing with the coated electrode.
In coverage paste, Protaweld® alginate prevents air bubble formation, adds plasticity, builds viscosity and body, and helps to maintain moisture. Protaweld® S200 also provides the paste with excellent green strength and minimal sagging, allowing it to form consistent thicknesses and homogeneity. During extrusion, the plasticity of the paste helps make the extrusion process of the welding electrode coating easier, enabling higher-capacity production without an increase in pressure. When drying, the alginate promotes better adhesion between the core and the coating, prevents cracking, and acts as an anti-sticking agent. Altogether, the functionality that Protaweld® S200 delivers to the flux coating process creates welding rods that have better bendability and superior welding ability.
Loss on drying (% max): 15
pH: 7.0–8.0
Viscosity (mPa·s): 300–500
Particle size (200 mesh, % min): 95
Particle size (100 mesh, % min): 100
Sulfated ash (%): 25.0–30.0
Sodium (%): 9.5–13.0
Potassium (% max): 1.00
Provides required viscosity and body to coverage paste
Improves plasticity and ease of extrusion of electrode coatings
Prevents formation of air bubbles in coverage paste
Retains moisture and reduces cracking of rods
Improves green bond strength
Produces smooth homogeneous surfaces for better welding
Poor welding quality due to uneven coatings on welding rods
High extrusion pressure during welding rod coating
Cracking of welding rod coatings
Production of basic-electrode, low-hydrogen welding rods
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