电焊工考试试题.docx

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电焊工考试试题.docx

电焊工考试试题

电焊工考试试题

部门:

姓名:

一.填充题;(每空0.5分,共20分)

1.不同厚度钢板对接,进行环缝焊接时,应对厚板进行处___理。

2.焊接接头的基本形式可分对接接头、、——————————————————

、搭接接头。

————

3.焊接时常见的焊缝内部缺陷有气孔、、、—————————————————

、未焊透、加钨等。

—————————

4.焊接电缆的常用长度不超过米。

——————

5.厚度较大的焊接件应选用较大的焊条。

————————

6.焊条直径的选择应考虑、、焊接—————————————————————————位置、焊接层数。

7.一般电弧焊接过程包括、、————————————————————————————

——————————

8.有限空间场所焊接作业的主要危险是缺氧窒息、——————————、、易于触电。

————————————————

9.在易燃易爆、有毒、窒息等环境中焊接作业前,必须进行——

和作业。

————————————

10.焊条受潮后为焊接工艺性能变差,而且水分中的氢容易产生

、等缺陷。

——————————————————

feelfreetolistentotheirvoicesandhelpthemassessolveproblems,wewereofficiallyopenedonMay10"12345"Mayorcalls,formulatedrulesandregulations,equippedwithafull-timestaff,a24-houron-dutysystem,peopletocalltoreceive,reply,action,reminders,feedbackandsoon.Byyearend,handledthecrowdcalls1076,94.7%feedbackrate.ByMayorcallsactivecoordinationtosolvealargenumberofbearsontheimmediateinterestsofthepeopleandissuesofgreatlives,butalsoforleadershipresearchanddecisiontocollectalotofgoodideasandsuggestions,byallsectorsofthecommunityalike.Second,startMunicipalGovernmentAffairsHallbuilt.OnMay11,webuiltandlaunchedthecity-governmentlobby,weresettledin12departments,strictimplementationoffirstaskingdutysystem,servicesystem,systemofgratuitous,"receiving,internalcoordination,headofthewindowhandle,limitedtimeconcluded"one-stopservice.Bytheendoftodaytoacceptvarioustypesof3,273,originallyofupto100%.RunningGovernmentAffairsHall,theconvenienceofthemasses,promotingopenGovernment,improvetheinvestmentenvironmentandsolvetheirpracticalproblems,andsodidalotofwork,masses,servethecommunityfortheGovernmenttoplayaverygood"window,link,model".Third,createacitygovernmentpublicaffairsnetwork.WerelyontheGovernmentWebsite,wascompletedonMay24,theprovince'sfirstpublicaffairsnetwork.Over

11.常用钢材中的五大元素,影响焊接性能的主要元素是—————、、磷。

———————

12.气体保护焊可以分成气体保护焊、气———————————————————体保护焊两大类。

13.下列操作应在切断电源后进行、、—————————————————————

、检修焊机、更换保险丝。

———————————

14.自动埋弧焊的主要焊接工艺参数为、———————————————————

、。

——————————————

15.焊接残余变形的矫正法有和——————————————————————————两大类。

16.焊接接头中以的疲劳强度最高。

——————————————

17.能降低焊件焊后的冷却速度。

————————

18.消除或减小焊接残余应力的方法有整体高温回火、———————

、、温差拉伸法、机械震动法。

—————————————————————

19.焊接残余变形可分为角变形、、波浪变形、—————————————

、横向缩短。

———————————

20.防止或减少焊接变形的工艺措施有选择合理的、——————————选择合理的和、反变形法、刚性固定法、————————————————————

散热法。

二.选择题:

(每题1分,共20分)

1.焊接时,使焊条药皮发红的热量是()

A.电阻热B.电弧热C.化学热

feelfreetolistentotheirvoicesandhelpthemassessolveproblems,wewereofficiallyopenedonMay10"12345"Mayorcalls,formulatedrulesandregulations,equippedwithafull-timestaff,a24-houron-dutysystem,peopletocalltoreceive,reply,action,reminders,feedbackandsoon.Byyearend,handledthecrowdcalls1076,94.7%feedbackrate.ByMayorcallsactivecoordinationtosolvealargenumberofbearsontheimmediateinterestsofthepeopleandissuesofgreatlives,butalsoforleadershipresearchanddecisiontocollectalotofgoodideasandsuggestions,byallsectorsofthecommunityalike.Second,startMunicipalGovernmentAffairsHallbuilt.OnMay11,webuiltandlaunchedthecity-governmentlobby,weresettledin12departments,strictimplementationoffirstaskingdutysystem,servicesystem,systemofgratuitous,"receiving,internalcoordination,headofthewindowhandle,limitedtimeconcluded"one-stopservice.Bytheendoftodaytoacceptvarioustypesof3,273,originallyofupto100%.RunningGovernmentAffairsHall,theconvenienceofthemasses,promotingopenGovernment,improvetheinvestmentenvironmentandsolvetheirpracticalproblems,andsodidalotofwork,masses,servethecommunityfortheGovernmenttoplayaverygood"window,link,model".Third,createacitygovernmentpublicaffairsnetwork.WerelyontheGovernmentWebsite,wascompletedonMay24,theprovince'sfirstpublicaffairsnetwork.Over

2.焊前预热的主要目的是()。

A.防止产生偏折B.防止夹渣C.减少淬硬倾向,防止产生裂纹

3.熔渣的熔点应比被焊金属的熔点()A.高B.低C相等

4.()的焊缝极易形成热裂纹。

A窄而浅B窄而深C宽而浅

5.焊条电弧焊时,焊接区内氮的主要来源是()A药皮B母材C焊接区周围的空气6焊接电弧是气体的()现象。

A燃烧B导电C对流

7薄板焊接时宜采用()运条法。

A直线往复B锯齿形C月牙形

8为防止平板对接接头的角变形,可采用()。

A增加板厚B反变形法C增加根部间隙

9焊接电流主要影响焊缝的()

A熔宽B熔深C余高

10()位置焊接可选较大的焊接电流。

A.平焊B.横焊C.立焊D.仰焊

11()是指在焊接工程中,熔池中的气泡在凝固时未能逸出而残留下来所形成的空穴。

A气孔B.裂纹C咬边D夹渣

feelfreetolistentotheirvoicesandhelpthemassessolveproblems,wewereofficiallyopenedonMay10"12345"Mayorcalls,formulatedrulesandregulations,equippedwithafull-timestaff,a24-houron-dutysystem,peopletocalltoreceive,reply,action,reminders,feedbackandsoon.Byyearend,handledthecrowdcalls1076,94.7%feedbackrate.ByMayorcallsactivecoordinationtosolvealargenumberofbearsontheimmediateinterestsofthepeopleandissuesofgreatlives,butalsoforleadershipresearchanddecisiontocollectalotofgoodideasandsuggestions,byallsectorsofthecommunityalike.Second,startMunicipalGovernmentAffairsHallbuilt.OnMay11,webuiltandlaunchedthecity-governmentlobby,weresettledin12departments,strictimplementationoffirstaskingdutysystem,servicesystem,systemofgratuitous,"receiving,internalcoordination,headofthewindowhandle,limitedtimeconcluded"one-stopservice.Bytheendoftodaytoacceptvarioustypesof3,273,originallyofupto100%.RunningGovernmentAffairsHall,theconvenienceofthemasses,promotingopenGovernment,improvetheinvestmentenvironmentandsolvetheirpracticalproblems,andsodidalotofwork,masses,servethecommunityfortheGovernmenttoplayaverygood"window,link,model".Third,createacitygovernmentpublicaffairsnetwork.WerelyontheGovernmentWebsite,wascompletedonMay24,theprovince'sfirstpublicaffairsnetwork.Over

12在焊接一些厚度较大,焊接接头冷却较快和母材金属淬硬倾向较大的焊件时,焊缝中容易产生()

A气孔B夹渣C咬边D冷裂纹

13焊接的坡口钝边如太大,在焊接时容易产生()A焊瘤B夹渣C咬边D.未焊透

14当焊条的药皮中含有较多的()时会降低电弧燃烧的稳定性。

A钾B钠C钙D氟化物

15弧长缩短时,焊接电弧静特性曲线将()

A上升B下降C不变

16.提高弧焊电源的空载电压,则电弧稳定性将()A提高B不变C下降

17要求焊缝有良好的塑性、韧性和抗裂性能时,应选用()焊条。

A.酸性焊条B.铁粉高效焊条C.碱性焊条

18焊接碳素钢熔渣的主要成分是()。

A碳化物B氟化物C氧化物D硫化物19()坡口加工最容易。

A(V形B.X形C.U形

20焊接电缆时采用多股细()制成。

A钢丝B铝丝C铜丝D不锈钢丝

三.判断题(每题1分,共20分)

1电弧是各种熔焊方法的热源。

()feelfreetolistentotheirvoicesandhelpthemassessolveproblems,wewereofficiallyopenedonMay10"12345"Mayorcalls,formulatedrulesandregulations,equippedwithafull-timestaff,a24-houron-dutysystem,peopletocalltoreceive,reply,action,reminders,feedbackandsoon.Byyearend,handledthecrowdcalls1076,94.7%feedbackrate.ByMayorcallsactivecoordinationtosolvealargenumberofbearsontheimmediateinterestsofthepeopleandissuesofgreatlives,butalsoforleadershipresearchanddecisiontocollectalotofgoodideasandsuggestions,byallsectorsofthecommunityalike.Second,startMunicipalGovernmentAffairsHallbuilt.OnMay11,webuiltandlaunchedthecity-governmentlobby,weresettledin12departments,strictimplementationoffirstaskingdutysystem,servicesystem,systemofgratuitous,"receiving,internalcoordination,headofthewindowhandle,limitedtimeconcluded"one-stopservice.Bytheendoftodaytoacceptvarioustypesof3,273,originallyofupto100%.RunningGovernmentAffairsHall,theconvenienceofthemasses,promotingopenGovernment,improvetheinvestmentenvironmentandsolvetheirpracticalproblems,andsodidalotofwork,masses,servethecommunityfortheGovernmenttoplayaverygood"window,link,model".Third,createacitygovernmentpublicaffairsnetwork.WerelyontheGovernmentWebsite,wascompletedonMay24,theprovince'sfirstpublicaffairsnetwork.Over

2焊芯的作用只是传递电流。

()

3焊剂使用前必须进行烘干。

()

4E4303是典型的碱性焊条。

()

5搭接接头的强度没有对接接头高。

()

6钝边的作用是防止接头根部焊穿。

()

7焊接电压增加时,焊缝厚度和余高将略有减小。

()8焊缝的形成系数越小越好。

()9药皮焊条与光焊条相比,容易产生焊缝加渣。

()10碱性焊条的烘干温度应该比酸性焊条好。

()11焊丝上镀铜的目的是,防止产生焊接裂纹。

()12气体保护焊很易于实现全位置焊接。

()13搭接接头的焊缝形式是属于角焊缝。

()14焊接长焊缝时,连续焊变形最大。

()15采用碱性焊条时,应该用短弧焊接。

()

16为了减小应力,应该先焊接结构中收缩量最小的焊缝。

()

17常采用的断续角焊缝应该是交错的。

()

18在同样厚度和焊接条件下,X型坡口的变形比V型大。

()

feelfreetolistentotheirvoicesandhelpthemassessolveproblems,wewereofficiallyopenedonMay10"12345"Mayorcalls,formulatedrulesandregulations,equippedwithafull-timestaff,a24-houron-dutysystem,peopletocalltoreceive,reply,action,reminders,feedbackandsoon.Byyearend,handledthecrowdcalls1076,94.7%feedbackrate.ByMayorcallsactivecoordinationtosolvealargenumberofbearsontheimmediateinterestsofthepeopleandissuesofgreatlives,butalsoforleadershipresearchanddecisiontocollectalotofgoodideasandsuggestions,byallsectorsofthecommunityalike.Second,startMunicipalGovernmentAffairsHallbuilt.OnMay11,webuiltandlaunchedthecity-governmentlobby,weresettledin12departments,strictimplementationoffirstaskingdutysystem,servicesystem,systemofgratuitous,"receiving,internalcoordination,headofthewindowhandle,limitedtimeconcluded"one-stopservice.Bytheendoftodaytoacceptvarioustypesof3,273,originallyofupto100%.RunningGovernmentAffairsHall,theconvenienceofthemasses,promotingopenGovernment,improvetheinvestmentenvironmentandsolvetheirpracticalproblems,andsodidalotofwork,masses,servethecommunityfortheGovernmenttoplayaverygood"window,link,model".Third,createacitygovernmentpublicaffairsnetwork.WerelyontheGovernmentWebsite,wascompletedonMay24,theprovince'sfirstpublicaffairsnetwork.Over

19焊件的装配间隙越大,横向收缩量越大。

()

20焊机空载电压一般不超过100V,否则将对焊工产生危险。

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