WELDING CURRENT MEASUREMENT METHOD Russian patent published in 2011 - IPC B23K11/24 

FIELD: measurement equipment.

SUBSTANCE: method can be mainly applied for measurement of welding current during setting of contact machines to the specified welding modes and in automatic control systems with current feedback. During welding the actual current value I₁ is measured on the side of primary winding of welding transformer, actual value of welding current I₂ and duration t_λ, of pulse of welding current is determined on the side of the secondary circuit. In addition, instantaneous current i₁(t_λ) is measured on the side of primary winding when pulse of welding current with duration of t_λ ends. Actual value of welding current I₂ is calculated depending on I₁, i₁(t_λ), t_λ considering K - transformation coefficient at the specified transformer stage and 0.5T - half of period of supply voltage.

EFFECT: method allows improving measurement accuracy of welding current on the side of primary winding of welding transformer and considerably simplifying the hardware part.

3 dwg, 1 ex