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1. What metal material is the twist drill made of?
A: It consists of high speed steel.
2. What parts of the electrical control circuit usually consist of?
Answer: It consists of lighting circuit, control circuit, signal circuit and other lighting circuits.
3. What is a hydraulic circuit?
A: A typical circuit that consists of hydraulic components and performs a specific function.
4. What are the mechanical precision of the parts?
A: There are dimensional accuracy, shape accuracy, and positional accuracy.
5. What is a low-voltage electrical appliance?
A: The electrical appliances that work under 1000V are low-voltage electrical appliances.
6. What are the main reasons for residual stress and deformation after welding of steel structures?
Answer: The steel structural parts are partially heated and cooled, and the metal heat expansion and contraction in the high temperature area is hindered by the surrounding cold metal.
7. What is correction?
Answer: Correction is to plastically deform the steel under the action of external force, so that the fiber partially contracted by the steel is elongated, the elongated fiber is shortened, and the fiber length of the metal part is uniform to eliminate the defects of surface unevenness, bending, twisting and wave deformation. To get the correct shape.
8. What is the magnitude of the welding current to be determined?
A: According to the type of welding rod, the diameter of the welding rod, the thickness of the weldment, the form of the joint, the position of the weld, the level of the weld bead, etc.
9. For welded parts with high technical requirements, what should be considered during assembly?
Answer: Assembly clearance, welding shrinkage.
10. What is the diameter of the electrode selected according to the welding?
A: Weld thickness, joint form, weld position, weld bead level.
11. What are the two major categories of manual welding machines for arc welding?
A: AC arc welder and DC arc welder are two major categories.
12. What are the common defects of elbows?
A: There are: bulging, flattening, folding, ellipse, bending and so on.
13. What methods can be used to bend steel profiles?
A: Rolling, bending, and bending.
14. What are the methods for bending the pipe?
A: Press (top) bend, roll, bend back, bend.
15. What types of welding rods are classified according to their slag characteristics after their coatings are melted?
A: It is divided into two categories: acid electrode and alkaline electrode.
16. What are the two categories of size benchmarks that can be classified according to their nature?
A: It can be divided into two categories: design basis and process benchmark.
17. How can the expression method of cold work structure chart be divided into several types?
A: It can be divided into three types: structure diagram, simple structure diagram and complex structure diagram.
18. What is the weldability of metal materials?
A: It is determined by physical and chemical solderability and process solderability.
19. How many rivets are commonly used?
A: There are semi-circular heads, countersunk heads, semi-sunk heads, flat heads, flat cone heads, oblate, flat.
20. What is assembly?
A: The individual parts are combined into a member's name according to certain technical conditions.
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