3.铸钢生产特点—— 1)锡青铜:结晶温度范围宽铸造性能差 但不易氧化 2)铝青铜或铝黄铜: 结晶范围窄逐层凝固因铝容易氧化 形成夹渣应采取挡渣措施 3)黄铜: 铸造性能好在锡青铜和铝青铜之间 硅黄铜在黄铜中最易铸造采用顺序凝固补缩 金属型种类:5.低压铸造连续铸管:磁型铸造:将流变铸造坯料加热至半固态放入压型中形成铸件
第十三讲:常用焊接方法 General Ways of Welding一 埋弧自动焊 (Submerged Arc Welding)二气体保护焊(Gas Shielding Arc Welding)三电渣焊(Electro-Slag Welding)四压焊(Pressure Welding)五钎焊(Soldering Welding )一埋弧自动焊 Submerged Arc Welding
第十三讲:常用焊接方法 General Ways of Welding一 埋弧自动焊 (Submerged Arc Welding)二气体保护焊(Gas Shielding Arc Welding)三电渣焊(Electro-Slag Welding)四压焊(Pressure Welding)五钎焊(Soldering Welding )一埋弧自动焊 Submerged Arc Welding
测试流动性试样示意图二.合金的收缩( Alloys Contraction) 1.收缩概念:金属液在冷却过程中引起的 体积缩减 用体收缩率或线收缩率表示 2.收缩的三个阶段: (1)液态收缩 (2)凝固收缩 (3)固态收缩注
第十二讲:焊接Welding 一焊接概述Outline of Welding二焊接过程及电焊条Process of Welding and Welding Rod 三接头组织和性能Structure and Property of Joint四焊接应力与变形Welding Stress and Distortion一焊接概述 Outline of Welding 1概念:经加热或加压,使两
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第十二讲:焊接Welding 一焊接概述Outline of Welding二焊接过程及电焊条Process of Welding and Welding Rod 三接头组织和性能Structure and Property of Joint四焊接应力与变形Welding Stress and Distortion一焊接概述 Outline of Welding 1概念:经加热或加压,使两
第十二讲:焊接Welding 一焊接概述Outline of Welding二焊接过程及电焊条Process of Welding and Welding Rod 三接头组织和性能Structure and Property of Joint四焊接应力与变形Welding Stress and Distortion一焊接概述 Outline of Welding 1概念:经加热或加压,使两
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