1. Vocational skill appraisal guidance-Welder China Labor Publishing House

ISBN: ISBN 7-5045-1913-8

2 "National Vocational Qualification Training Course-Welder" China Employment Training Technical Guidance Center

ISBN: ISBN 7-5045-3819-1

3. Theoretical examination questions: fill-in-the-blank questions, true-false questions, multiple-choice questions and short-answer questions.

Fourth, skill operation questions:

Q235A steel plate-plate butt welding (manual arc welding one-sided and double-sided forming)

CO2 welding plate-to-plate butt welding (one-sided welding and double-sided forming)

Verb (abbreviation of verb) Note:

1. Candidates should bring their own protective equipment (overalls, masks, gloves and all auxiliary tools, including angle grinder).

2. The practice test lasts for 120 minutes, including 60 minutes for manual arc welding and 40 minutes for CO2 welding (including polishing, assembly and positioning time).

3. The order of skill test is determined by drawing lots (the drawing time is before the theoretical test).

4. See the annex for the technical requirements and scoring standards of the examination.

Attachment 1. The First Agricultural, Civil and Industrial Competition in Maanshan

Review the materials about welding theory.

Fill in the blanks

The phase diagrams of 1 and Fe-Fe3C are diagrams showing the relationship between components and or under conditions.

2. This line is the beginning line of ferrite precipitation from austenite during cooling and the end line of ferrite transformation into austenite during heating, which is generally indicated by symbols.

3. The PSK line in the 3.Fe-Fe3C phase diagram is a line and appears on this line.

4. In heat treatment production, there are two common cooling methods: and.

5, the critical cooling rate of steel is said.

6. The compound treatment process of quenching and high temperature tempering is often called in production.

7, the basic process of chemical heat treatment is, and. ?

8. The plastic deformation of single crystal is mainly through.

9. In the whole circuit, the current is directly proportional to and inversely proportional to.

10, Joule Lenz's law points out that the heat generated when a current passes through a section of conductor is directly proportional to the quadratic power of the current, inversely proportional to the current, and directly proportional to the current. ?

1 1 has nothing to do with the choice of zero potential, but changes with the choice of zero potential.

12 is the basic law used to solve the calculation of complex circuits.

13, any closed path in the circuit is called.

14, ohm's law of magnetic circuit is.

15, magnetic induction b and dielectric permeability? 0? The ratio of 8 is called.

16, the ionization of gas particles caused by heating is called, the higher the temperature, the more thermoelectric ionization.

17, the ionization of neutral particles under the action of radiation is called.

18, the necessary conditions for arc generation and maintenance are.

19, submerged arc welding, welding wire has two functions, on the one hand, on the other hand.