对大学生自主学习意识的培养是自主学习能力培养的重要内容,但在传统的教学和考试模式中对大学生自主学习意识和自由学习能力的培养却存在很多不足.通过对机械制造基础课程教学及考试进行改革试验,发现在教学中采用教师引导式的讲授结合学生的讨论、课后查阅资料、分组完成一定的课题及答辩、下工厂实地学习等方法进行教学,配合考试的改革,能收到很好的效果;考试采用平时与阶段性考试两种方式.采用这种教学与考试模式大大提高了学生的学习积极性和主动性,取得了满意的效果.

It’s the important reference factors of choosing the steel and making technology for heating processing for the quenching degree and hardenability. This paper discussed the factors of influencing the quenching degree and hardenability by changing the content of the material, and changing the speed of cooling the steel, and get the ways to improve the quenching degree is to change the composition to make the Curve C right shift and increase the cooling speed; And the way to improve the hardenability is to improve the carbon content and add the alloying element.

创新人才的培养是高等学校面临的永恒的重要课题之一，如何培养创新人才是高等院校尤其是地方性高等院校的难题，本文针对地方性高等院校的创新人才的培养的制约因素进行了剖析，提出了相应的解决措施和途径。

The effect of different welding parameters on weld is tested by the 304 stainless steel melt electrode argon arc welding process test to study, the reasonable welding process parameters are determined when welding Austenitic stainless steel plate.

Medium box is a main part of magnetic separation machine,induced magnetic field is produced during it's work,and the magnetic medium is sent into and out of the separation zone. Medium box is a kind of weld assembly,after used for a period of time; the fracture of welding line and heat affected zone will affect mineral separation. In this paper,the reasons of the fracture were analyzed. The solving measures are obtained,the service life of the medium box and the efficiency of mineral separation are improved.

Professional training scheme is the basic of carrying out the aim of personnel training and comprehensive quality education,training higher quality talents,organizing all kinds of teaching in high schools.In order to deepening reform of the talent training mode,it's very important to designate the reasonable talents training target and mode through the continuous exploration and practice.

Engineering Material,a fundamental technical course for mechanical engineering students in college,plays an important role in teaching and graduation project for specialized course.Through reforming teaching content and methods,it will enhance students ’spirit of studying and arouse their interest greatly with more harvest.Further more,it will lay a strong foundation for studying and working in the future.

Through the analysis of corrosion of the crude oil bottom plate,the article gives some protective measures: to use pitch,to use electrochemistry protection,to use coating.It can raise live span more five years.

The impeller plate and the impeller films of air compressor are 34CrNi3MoA.welding quality of Central carbon mixing quality steel 34CrNi3MoA is poor,and is more difficult to weld in under the state of mixing quality in air compressor.The essay further researches welding quality for guaranteeing welding.Found out the Welding crafts.

The essay analyses crooked shape and angle steel shape of welding工-steel theoretically and proposes the craft measure to prevent deformation.Adopting the craft of movable upright nodular iron is put forward to prevent welding deformation and improve work efficiency.

Through analysis and experiment on affecting the parameter of the plasma arc,four main factors were selected,which were compressed,cutting high gun,electrode to the nozzles distance and cutting speed.The best cutting parameter through the experiment is discovered,and the way of using the parallel method to enhance remarkably the quality of cut is proposed.

L2 weldability was analyzed and welding craft of pure aluminum was studied by using the exchange tungstic electrode argon.Then the reasonable welding craft was discovered to solve the problems that pure aluminum L2 welding was difficult to fuse,but easy to rain,attach Tungsten and produce blowhole and cracks.

Carbon dioxide low temperature store-pot adopts low-temperature steel 16MnDR making requires good toughness of low temperature striking. In order to guarantee the good impact toughness of the welding seam under the low temperature , usually adopts the hand arc-welding or the argon arc-welding. In order to reprove productivity, we try boldly the Lincoln welding , gets satisfactory result and succeed.

The article analyzes synthetically the character of inner weld crack in middle-pressure gas tank by radial ultrasonic magnetization powder,hardness and metallography method.The result is that inner weld crack comes from original crack and survivals crack,which grows on weld heated circulation and liguefacient crack.

焦化装置中钢架部分钢柱H型钢焊接变形的控制是保证其制造质量的关键,通过分析找出了影响H型钢焊接变形的因素,采用防变形夹胎具及合理的焊接参数和施焊顺序,保证了H型钢的焊接质量。

对罐底、罐顶、罐壁的变形进行了分析,并提出了有效的控制措施,收到了良好的效果。

The reason of wainscot distortion during the install with the middle small column type oilcan was analysed.New idea was pointed out the circumferential weld’s clearance difference lead the wainscot’s uprightness to overrun.As the protection,idiographic protect measures and requirements were pointed out from every manufacture step.The estimate formula of expand circumferential strength and its section dimension requirement also were mentioned,which could be regarded as the reference in the experience.

0 概述 聚合釜系1万吨/年聚丙烯装置的关键设备,该设备为夹套式结构,属三类压力容器,内筒材质为16MnR,其操作温度76℃,操作压力3.53 MPa,介质为丙烯、聚丙烯;夹套材质为16MnR,操作温度90℃,操作压力0.3 MPa,介质为水.在运行时聚合釜本体,搅拌系统及物料总重约23 t.聚合釜外形及结构尺寸见图1.

Drawing the best matching and craft of rich-argon mixing gas protecting welding,getting application in the production of pressure container.The appearance net merely takes shape beautifuly and has smasplashing,mechanics performance fulfils requirements,and its productivity improves by 4-times than hand arc-welding,etc..

对一定数量的钢制压力容器焊缝内缺陷的焊接修补质量进行了综合分析,采用超声波探伤等检测手段,定量地确定缺陷性质,指出在超声波探伤过程中应该注意的有关技术问题,提出超声波检测是一种有效的对钢制压力容器的焊接进行质量控制的技术.