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【单选题】
焊条药皮又称涂料,在焊接过程中起着极为重要的作用。它可以起到积极保护作用,利用药皮熔化放出的气体和形成的___,起机械隔离空气作用,防止有害气体侵入熔化金属。(中 )
A. 焊缝
B. 熔渣
C. 焊皮
D. 焊接
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答案
B
解析
暂无解析
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【单选题】
焊条药皮的组成主要有稳弧剂、造气剂、造渣剂、脱氧剂、合金剂、粘接剂和___等。( 易 )
A. 增塑剂
B. 增强剂
C. 硬化剂
D. 塑化剂
【单选题】
焊条电弧焊有两种引弧方式:划擦法和___法。( 难 )
A. 点击
B. 横击
C. 直击
D. 斜击
【单选题】
焊条电弧焊是依靠人手工操作焊条运动实现焊接的,此种操作也称___。(中)
A. 手焊
B. 自动焊
C. 运焊
D. 运条
【单选题】
常见的焊条电弧焊运条方法有___种。(易)
A. 5
B. 6
C. 7
D. 8
【单选题】
为不影响焊缝成形,保证接头处焊接质量,更换焊条的动作越快越好,并在接头弧坑前约 ___ mm处起弧,然后移到原来弧坑位置进行焊接。(中)
A. 15
B. 16
C. 17
D. 18
【单选题】
焊缝的收尾操作时,应保持正常的熔池温度,做无直线运动的横摆点焊动作,此外还有三种焊缝收尾的操作方法,即___收尾法、反复断弧收尾法和回焊收尾法,也在实践中常用。(难)
A. 划圈
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【单选题】
在实际生产中,由于焊接结构和零件移动的限制,焊缝在空间的位置除平焊外,还有立焊、横焊、仰焊。其中焊接条件___位置最差。(中)
A. 仰焊
B. 横焊
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【单选题】
电弧焊机行走机构:是使焊接机头和零件之间产生一定速度的相对运动,以完成___焊接过程的机械装置。(中)
A. 整个
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【单选题】
接头形式电阻焊可分成点焊、缝焊、凸焊和___四种。(中)
A. 对焊
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【单选题】
缝焊一般应用在有密封性要求的接头制造上,适用材料板厚为___ mm,如汽车油箱、暖气片、罐头盒的生产。(难)
A. 0.1~0.02
B. 0.1~0.2
C. 0.1~2
D. 0.1~20
【单选题】
工件焊后一般都会产生变形,如果变形量超过___值,就会影响使用。( 中 )
A. 标准
B. 一定
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D. 误差
【单选题】
焊接变形产生的主要原因是___不均匀地局部加热和冷却。(中)
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【单选题】
焊接产生拉应力和压应力,当这些应力超过金属的___极限时,将产生焊接变形;当超过金属的强度极限时,则会出现裂缝。(难)
A. 屈服
B. 抗拉
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【单选题】
焊瘤对静载强度无影响,但会引起应力集中,使___强度降低。(难)
A. 抗拉
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【单选题】
焊缝的外部缺陷五种:焊缝增强过高,焊缝过凹,焊缝咬边,___,烧穿。(难)
A. 焊缝开裂
B. 焊缝过高
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D. 焊瘤
【单选题】
焊缝中熔入过多的___,也会引起冷裂纹。(难)
A. 氢
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【单选题】
焊接质量的检验包括___试验三个方面。这三者是互相补充的,而以无损探伤为主。(中)
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C. 外部检查、无损探伤和机械性能
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【单选题】
___目前使用最普遍的是采用X射线检验,还有超声波探伤和磁力探伤。
A. 无损探伤
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【单选题】
焊条电弧焊是利用焊工眼睛、脑、手配合适时调整弧长,电弧焊自动调节系统则应用___控制系统进行调节。(中)
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CO2 气体保护焊工艺具有生产率___、焊接成本低、适用范围广、低氢型焊接方法焊缝质量好等优点。( 易 )
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CO2 气体保护焊设备可分为___焊和自动焊两种类型。(中)
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30、导体的电阻不但与导体的长度、截面有关,而且还与导体的()有关。(中)
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D. 电压
【单选题】
31、并联电路中, 电流的分配与电阻成( )。(易)
A. 反比
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32、磁通的单位是(  )。(易
A. Wb
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33、串联电路具有以下特点( )。(易)  
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【单选题】
24、1安培等于()微安。(易)
A. 10³
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27、电路主要由负载、线路、电源、( )组成。(易)
A. 发电机
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【单选题】
26、额定电压为220V的灯泡接在110V电源上,灯泡的功率是原来的( )。(难)
A. 4
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25、将一根导线均匀拉长为原长度的3倍,则阻值为原来的( )倍。(难)
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由___、负载、开关经导线连接而形成的闭合回路称之为电路。(易)
A. 电源
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电源是提供___的装置.(易)
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为了准确地衡量某一时刻电流的大小或强弱,引入了___这个物理量。(易)
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电动势的单位是___。(易)
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___是衡量电场作功本领大小的物理量。(易)
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电阻常用字母R表示,其单位是___。(易)
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金属导体电阻的大小与导体长度成___,与横截面积成( )。(中)
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