{"title":"局部预热焊件冷却时间t8/5及热系数的估算。","authors":"T. Terasaki, K. Ishimoto","doi":"10.2207/QJJWS.9.436","DOIUrl":null,"url":null,"abstract":"Preheating is performed to prevent cold cracking in steel constructions. Preheating produces a good effect on cooling times, which are t8/5 (cooling time from 800°C to 500°C) related to the maximum hardness at HAZ, or which are t200, t150, t100 (tθ : cooling time from the solidification to θ) connected with the thermal factor. In the welding field, a whole member can not be preheated uniformly, and then local preheating near the weld line is generally performed.This report deals with local preheating and welding procedures of a butt joint and a corner joint. Predicted values of cooling times have been compared with the experimental data. The predicted values have been obtained by theoretical formulae. The results are summarized as follows :(1) Relation between cooling time and thermal factor, (ΣD·Δt)100 has been investigated. The thermal factor is correlated most closely with cooling time t150.(2) The predicted values of cooling time t8/5 and thermal factor (ΣD·Δt)100 have given good agreement with the experimental values.","PeriodicalId":273687,"journal":{"name":"Transactions of the Japan Welding Society","volume":"20 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":"{\"title\":\"Estimation of the Cooling Time t8/5 and Thermal Factor of Weldments with Local Preheating.\",\"authors\":\"T. Terasaki, K. Ishimoto\",\"doi\":\"10.2207/QJJWS.9.436\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"Preheating is performed to prevent cold cracking in steel constructions. Preheating produces a good effect on cooling times, which are t8/5 (cooling time from 800°C to 500°C) related to the maximum hardness at HAZ, or which are t200, t150, t100 (tθ : cooling time from the solidification to θ) connected with the thermal factor. In the welding field, a whole member can not be preheated uniformly, and then local preheating near the weld line is generally performed.This report deals with local preheating and welding procedures of a butt joint and a corner joint. Predicted values of cooling times have been compared with the experimental data. The predicted values have been obtained by theoretical formulae. The results are summarized as follows :(1) Relation between cooling time and thermal factor, (ΣD·Δt)100 has been investigated. The thermal factor is correlated most closely with cooling time t150.(2) The predicted values of cooling time t8/5 and thermal factor (ΣD·Δt)100 have given good agreement with the experimental values.\",\"PeriodicalId\":273687,\"journal\":{\"name\":\"Transactions of the Japan Welding Society\",\"volume\":\"20 1\",\"pages\":\"0\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"1900-01-01\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"1\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Transactions of the Japan Welding Society\",\"FirstCategoryId\":\"1085\",\"ListUrlMain\":\"https://doi.org/10.2207/QJJWS.9.436\",\"RegionNum\":0,\"RegionCategory\":null,\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"\",\"JCRName\":\"\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Transactions of the Japan Welding Society","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.2207/QJJWS.9.436","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}
Estimation of the Cooling Time t8/5 and Thermal Factor of Weldments with Local Preheating.
Preheating is performed to prevent cold cracking in steel constructions. Preheating produces a good effect on cooling times, which are t8/5 (cooling time from 800°C to 500°C) related to the maximum hardness at HAZ, or which are t200, t150, t100 (tθ : cooling time from the solidification to θ) connected with the thermal factor. In the welding field, a whole member can not be preheated uniformly, and then local preheating near the weld line is generally performed.This report deals with local preheating and welding procedures of a butt joint and a corner joint. Predicted values of cooling times have been compared with the experimental data. The predicted values have been obtained by theoretical formulae. The results are summarized as follows :(1) Relation between cooling time and thermal factor, (ΣD·Δt)100 has been investigated. The thermal factor is correlated most closely with cooling time t150.(2) The predicted values of cooling time t8/5 and thermal factor (ΣD·Δt)100 have given good agreement with the experimental values.
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