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Segregation Coefficient for Welding Consumables

The segregation coefficient indicates how strongly a filler metal crystallizes in the liquid melt. A high coefficient means rapid segregation and low risk of porosity.

Physikalisch-chemischer Wirkmechanismus

The segregation coefficient (Sk) describes the crystallization speed of a filler metal in the molten pool. It measures the filler's attraction to the crystal grains and influences pore formation.

Metallurgical relevance & welding risks

A high segregation coefficient leads to fast segregation and prevents pore buildup. A low coefficient can cause slow segregation and a high number of pores, which weakens the weld.

Workshop practice & action points

To ensure optimal segregation, pick fillers with a high segregation coefficient. For hard-to-see fillers (Sk < 0.5), watch out for enough melt time and controlled cooling to minimize porosity.

MetallurgieSchweißtechnik

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