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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 a sodium alginate polymer designed to create high-quality coatings for welding electrodes. Protaweld® S200 is typically added at concentrations between 0.5–2.0 wt% and optimizes the overall rod manufacturing process beginning with the addition of the coverage paste to the coated electrode at the end.
In the coverage paste, the Protaweld® S200 alginate prevents the formation of air bubbles and helps to build viscosity and body, increase plasticity, and maintain moisture. Providing excellent green strength and minimal sagging, Protaweld® S200 allows coverage pastes to form homogenously and with more consistent thicknesses.
The plasticity of the paste aids in the extrusion process enabling higher-capacity production without an increase in pressure. When drying, there is better adhesion between the core and the coating. Additionally, the chance of cracking is reduced, and anti-sticking properties are gained. The functionality that Protaweld® S200 delivers to the flux coating process creates welding rods with improved bendability and superior welding characteristics.
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
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
Primary Chemistry: Sodium alginate
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