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【单选题】
爆炸下限较低的可燃气体、蒸汽或粉尘,危险性___
A. 较大
B. 较小
C. 没影响
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A
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在转移型等离子弧中,接电源正极的是___
A. 喷嘴
B. 工件
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二氧化碳由液态变为气态的沸点为___℃
A. -68
B. -78
C. -88
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堆焊速度过小,堆焊层加厚,焊缝(焊道)___。
A. 加宽
B. 变窄
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灭火的基本原则之一是"___重于救火"。
A. 救人
B. 救贵重物
C. 抢救财产
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焊机的接地回路应尽量___,软线绝缘应良好
A. 长
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防止职业危害的措施主要有___措施和个体防护措施两种。
A. 技术
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二氧化碳气体保护焊时,由于氧气和紫外线作用强烈。适宜穿戴___
A. 亚麻工作服
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下列说法错误的是___
A. 从业人员对于安全的知情权,是保护劳动者生命健康权的重要前热
B. 从业人员有权了解其作业场所和工作岗位与安全生产有关的情况
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碳孤气刨一般采用的电源是___电源
A. 交流
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关于钎焊从业人员的义务,下列说法正确的是___
A. 从业人员必须接受专门的安全生产教育和业务培训
B. 从业人员一般不是事故隐患和不安全因素的第一当事人
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氩弧焊时,喷嘴过大会造成___
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氧化焰可焊接的材料是___
A. 铝及铝合金、低碳钢、低合金钢
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埋弧焊熔炼焊剂名称中第一位数字表示焊剂中___
A. 硅的含量
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氧熔剂是指细铁粉中混入___
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退火后钢铁材料的硬度一般会___
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【单选题】
估算瓶内二氧化碳贮量的方法为___
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【单选题】
关于短路过渡和颗粒过渡的说法,下列错误的是___
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【单选题】
关于铝及铝合金激光焊的说法,下列错误的是___
A. 焊缝中容易产生气孔
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【单选题】
一般不发炎或化脓,但往往造成局部麻木和失去知觉的电击形式是___
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以下说法错误的是___
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工业中的"三酸两碱"不包括___
A. 盐酸
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与一般焊接相比,堆焊的基本规律与之不同,主要体现在其___
A. 化学本质
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对纯铜进行气焊时,应采用___
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下送风式面罩又称为___
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青铜的可塑性___
A. 一般
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手工电弧堆焊的应用形式是___
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固定式排烟罩的特点是___。
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【单选题】
原子氢焊时产生的有害气体包括___。
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焊接工作场所局部通风应用比较普遍的是___
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关于氧化焰的说法,下列正确的是___
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为防止电渣焊时产生爆渣或漏渣引起的烧伤,应___
A. 选用氟化钙含量低的焊剂
B. 焊前检查变压器冷却水畅通情况
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电渣焊可焊接的最大厚度达___mm
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关于氧气管道的管材规定,下列正确的是___
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二氧化碳气体预热器所使用的电压不得高于___V
A. 36
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氢气瓶是贮存和运输氢气的高压压力容器,瓶体表面为___
A. 深绿色
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细丝(≤1.6mm)短路过渡焊接时的保护气体流量一般为___L/min。
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【单选题】
关于隐弧排烟罩,下列说法正确的是___
A. 这类排烟罩适用于焊接大而长的焊件时排除电焊烟尘和有毒气体
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用MU2-1000型悬臂式单头纵环缝带极埋弧堆焊机堆焊的设,其堆焊内径为最小___
A. 1.5
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C. 2.5
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下列可用于等离子焊接冷却系统中冷却剂是___
A. 电解质溶液
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焊接作业时,丙烷瓶要远离火源___m以上
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