Welding determination device for belt-shaped sheets, and welding determination method
A technology for judging device and plate body, applied in welding monitoring device, welding of straight seam, welding equipment, etc., can solve the problems of poor joint, crack, time repair cost, etc.
Inactive Publication Date: 2019-11-22
JFE STEEL CORP +1
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Problems solved by technology
In such seam welding, poor joints may occur at the joints, and the joints may be broken in the production line due to poor joints, and the production line may stop
When the production line is stopped due to the breakage of the strip-shaped plate body, in addition to the decrease in the operating rate of the production line, there is an influence that it takes a lot of time to restore the production line and the repair cost associated with the repair increases.
Method used
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Examples
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Embodiment
[0061] Next, examples performed by the present inventors will be described. In the examples, similarly to the above-described embodiment, the presence or absence of spatter at the joint portion joined by welding was confirmed for steel strips 2 having various thicknesses, and the relationship between the generation of spatter and the temperature of the joint was studied. relation.
[0062] In the case where spatter was generated as a result of the examples, it was confirmed that there was an average temperature T of the junction compared with the normal case. ave tendency to rise. However, even under the condition that spatter does not occur in the same plate thickness, it has been confirmed that it fluctuates depending on the conditions, and it may be the same as the average temperature T when spatter occurs. ave In the case of the same degree of low temperature. It should be noted that, in the examples, relative to the average temperature T aveThe first threshold value i...
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The purpose of this invention is to accurately determine the occurrence of spatter in seam welding. This welding determination device comprises: a measurement unit (11) which measures the temperatureof a junction of a band-shaped sheet (steel belt (2), for example) to be joined by seam welding, and a determination unit (13) which, on the basis of the measurement results of the measurement unit (11), calculates the average temperature Tave and the temperature difference Delta T at the junction, and deems spatter to have occurred at the junction if the average temperature Tave is at or above afirst threshold value which is set according to the sheet thickness of the belt-shaped sheet, and if the temperature difference Delta T is at or below a second threshold value.
Description
technical field [0001] The present disclosure relates to a welding determination device and a welding determination method for a strip-shaped plate body at a joint portion of a strip-shaped plate body joined by seam welding. Background technique [0002] In a production line for manufacturing / handling strip-shaped plate bodies such as steel strips, the strip-shaped plate bodies are produced by hot-rolling or cold-rolling steel ingots or the like. In such a production line, when performing pretreatments such as pickling or coating of anti-rust oil on the strip-shaped plate body, it is not practical to perform each treatment on each strip-shaped plate body because of poor production efficiency. Therefore, a method of continuously performing these processes is used by welding and connecting end portions in the longitudinal direction of the strip-shaped plate bodies to each other. [0003] As a welding method for strip-shaped plate bodies, seam welding, which is a type of lap r...
Claims
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IPC IPC(8): B23K11/06
CPCB23K11/06B23K11/25B23K31/125B23K11/0026B23K11/061
Inventor 冲祐一郎作本大朗中谷隆文光冈良祐三鼓达辉
Owner JFE STEEL CORP