11.2 焊接图（课件）-《机械制图》同步精品课堂（劳保版 ·第8版）

第十一章 金属结构图、 焊接图和展开图 11.2 焊接图 同步精品课堂 同步精品课程——中职专业课 《机械制图》 中国劳动社会保障出版社 1 导入新课 2 探究新知 3 应用新知 4 展示评价 Contents 目 录 5 课堂小结 6 布置作业 01 导入新课 We have many PowerPoint templates that has been specifically designed to help anyone that is stepping into the world of PowerPoint We have many templates that has been specifically designed to help anyone 提问：大家知道这个构件上连接的部分是用什么方式连接的吗？这种连接方式在图纸上是如何表示的呢？ 导入新课 02 探究新知 We have many PowerPoint templates that has been specifically designed to help anyone that is stepping into the world of PowerPoint We have many templates that has been specifically designed to help anyone 金属结构件被焊接后所形成的接缝称为焊缝。焊缝在图样上一般采用焊缝符号 (表示焊接方式、焊缝形式和焊缝尺寸等技术内容的符号)表示。 一、焊缝符号及其标注方法 焊缝符号由基本符号和指引线组成,必要时还可以加上基本符号的组合、 补充符号和焊 缝尺寸符号及数据等 探究新知 表示焊缝横断面形状的符号,它采用近似焊缝横断面形状的符号来表示。 基本符号用粗实线绘制。 1.基本符号 探究新知 标注双面焊缝或接头时,基本符号可以组合使用 2.基本符号的组合 探究新知 说明与焊缝有关的某些特征 (如表面形状、衬垫、焊缝分布及施焊地点 等),用粗实线绘制 3.补充符号 探究新知 探究新知 指引线一般由箭头线和两条基准线(一条为细实线,一条为细虚线)组成 4.指引线 5.焊缝尺寸符号 焊缝尺寸符号用来表示坡口及焊缝尺寸,一般不必标注。 探究新知 焊接的方法很多,常用的有电弧焊、电渣焊、点焊和钎焊等,其中以电弧焊应用最广泛。 焊接方法可用文字在技术要求中注明,也可用数字代号直接注写在指引线的尾部。 二、焊接方法及数字代号 探究新知 三、焊缝标注示例 探究新知 金属焊接图表达：构件的形状、尺寸表达、焊接的有关内容 弯头（焊接件）组成：底盘、弯管、方形凸缘 识读要点： 底盘和弯管间焊缝 方形凸缘和弯管外壁的焊缝 方形凸缘和弯管的内焊缝 四、读焊接图举例 探究新知 03 应用新知 We have many PowerPoint templates that has been specifically designed to help anyone that is stepping into the world of PowerPoint We have many templates that has been specifically designed to help anyone 一.填空题。 1.焊缝基本符号是表示焊缝______的符号。​ 2.常见的焊接接头形式有对接接头、T 形接头、______、______等。​ 3.焊缝尺寸符号中，“h” 表示______。​ 4.当需要表示两种或两种以上焊缝形式组合时，应采用______的组合。​ 5.金属构件可以用______画出的简图表示。​​ 自主探究 应用新知 2.解读焊缝标注的含义。 组间PK 应用新知 组间PK 应用新知 3.请解读图纸， 并回答问题。 小组合作 应用新知 04 展示评价 We have many PowerPoint templates that has been specifically designed to help anyone that is stepping into the world of PowerPoint We have many templates that has been specifically designed to help anyone 小组代表分享： 焊缝符号及标注方法 常用焊接方法及数字 代号 一组 二组 三组 互评 师评 自评 展示评价 05 课堂小结 We have many PowerPoint templates that has been specifically designed to help anyone that is stepping into the world of PowerPoint We have many templates that has been specifically designed to help anyone 焊接图 课堂小结 06 布置作业 We have many PowerPoint templates that has been specifically designed to help anyone that is stepping into the world of PowerPoint We have many templates that has been specifically designed to help anyone 习题册 联系实际 解读图纸 相关习题 布置作业 感谢观看 $$