Process for short-time arc welding and short-time arc welding system
AssigneeNewfrey LLC
InventorsWolfgang Schmidt, Klaus G. Schmitt
Life of this patent
Estimating the term…
Abstract
A process and a system are proposed for short-time arc welding, in particular for stud welding, with the step of sampling a welding parameter, in particular the arc voltage (U), during at least one time segment (Ts) of the welding operation, in order to detect disturbances, wherein the measurement curve determined from the sampling operation is smoothed and subsequently wherein at least one tolerance curve is generated which lies at a previously adjustable distance from the smoothed measurement curve, and subsequently the unsmoothed measurement curve is compared with the tolerance curve in order to detect high-frequency disturbances.
Claims43
A process for determining the quality of a weld, the process comprising:
- (a) measuring a welding parameter over a specified time;
- (b) generating a measurement curve from the measuring;
- (c) smoothing the measurement curve;
- (d) creating a tolerance curve based on a smoothed measurement curve;
- (e) determining a difference between the tolerance curve and the measurement curve;
- and
- (f) evaluating the weld quality based on the difference.
A welding method for welding an element to a component using a feed unit and a welding head, the method comprising:
- (a) feeding the element from the feed unit to the welding head;
- (b) energizing the welding head;
- (c) welding the element to the component;
- (d) measuring a welding parameter during welding;
- (e) generating a measurement curve from the measuring;
- (f) smoothing the measurement curve;
- (g) creating a tolerance curve based on a smoothed measurement curve;
- (h) determining a difference between the tolerance curve and the measurement curve;
- and
- (i) evaluating the weld quality based on the difference.
A welding method for welding an element to a component using a feed unit and a welding head and ensuring weld quality, the method comprising:
- (a) feeding the element from the feed unit to the welding head;
- (b) lifting the element to a height along a substantially linear path in relation to the component;
- (c) energizing the welding head;
- (d) welding the element to the component;
- (e) measuring a welding parameter during welding for a specified time;
- (f) generating a measurement curve;
- (g) smoothing the measurement curve using a low pass filter creating a smoothed measurement curve;
- (h) creating a tolerance curve based on a specified tolerance above and below the smoothed measurement curve;
- (i) sensing a difference between the tolerance curve and the measurement curve;
- (j) evaluating the weld quality based on the difference;
- (k) retracting the element in relation to the component;
- and
- (l) stopping energy to the welding head.
A welding system for welding an element to a component, the system comprising:
- (a) a welding head operably initially moving the element in relation to the component and later returning the element;
- (b) a measurer operable measuring at least one welding parameter;
- (c) a power supply operably providing power for creating an arc between the component and the element;
- (d) a controller operably controlling the welding head and determining weld quality based on the measured parameter by generating a measurement curve from the measuring, smoothing the measurement curve, creating a tolerance curve based on the smoothed measurement curve and detecting a difference between the tolerance curve and a smoothed measurement curve;
- and
- (e) an analyzer operable evaluating arc voltage and controlling the power supply.
Dependencies are inferred from the claim text.