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Method of controlling the quality of seam welded product

阅读：891发布：2023-12-04

专利汇可以提供Method of controlling the quality of seam welded product专利检索，专利查询，专利分析的服务。并且A method of controlling the quality of a product having a weld seam extending longitudinally thereof, the seam being progressively produced by a welding arc generated across adjacent edges of product stock as the stock travels past a welding station, and as the edges are forced together at a location downstream from the welding station. The method includes the steps of continuously measuring a plurality of critical welding parameters as the seam is being formed, and identifying for rejection the lengths of the product welded when any one or group of the welding parameters deviate from limits predetermined for the parameters. By this method confidence levels of 99.95 percent, soundly welded product are obtained.，下面是Method of controlling the quality of seam welded product专利的具体信息内容。

权利要求

1. A method of controlling the quality of a continuously produced thin wall tubular product having a longitudinally extending weld seam, said seam being formed by an electrically produced welding arc generated across confronting edges of product stock at a welding station during relative movement between said stock and station, and as said edges are urged together in abutting relationship by at least three squeeze rolls circumferentially spaced around said tubular product at a single location downstream of said welding station, the method comprising the steps of selecting the levels of weld parameters required to produce a weld seam of a desired high quality for welding said product, said weld parameters consisting of the pressure at which each of the three squeeze rolls individually urge the confronting edges of the stock together, the speed of the relative movement of the stock, eddy currents induced in the welded product, and three electrical parameters consisting of the grid current of an oscillator tube employed in a power source supplying the power requirements of the welding arc, and the voltage and current of rectifiers employed in said source, choosing upper and lower limits of deviation for the selected levels of said weld parameters at which the welded product will be considered as defectively welded if at least one of the deviations is beyond said selected limits, continuously supplying the electrical power requirements of the welding arc and continuously measuring the above three electrical parameters, continuously urging the confronting edges of the said stock together and continuously and individually measuring the respective pressures at which the three squeeze rolls urge the edges of said stock together, measuring the speed of the relative movement of said stock, continuously inducing eddy currents in the welded product and continuously measuring said eddy currents, monitoring the position of said stock between the locations at which the above measuring steps are made and a location at which the product is cut into lengths of a predetermined length, identifying for rejection said predetermined lengths of the product welded when any of the measurements of said weld parameters obtained by the previous measuring steps deviate from the limits chosen therefor, and Rejecting said predetermined lengths of product welded when the weld parameters deviate from the limits chosen therefor.

2. The method of claim 1 including the additional steps of continuously circulating a flow of coolant to and from a reservoir thereof over an impeder element located within the product stock and in the field of an induction coil at the welding station, and continuously controlling the flow rate of said coolant.

3. The method of claim 1 in which the step of inducing the eddy currents in the welded tubular product is effected by a coil structure having a cross sectional configuration corresponding to that of the welded product.

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Method of controlling the quality of seam welded product

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