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Welding knowledge 2

1. What is an arc?

Answer: The strong and lasting gas discharge between the two electrodes supplied by the welding power supply is called an arc.

〈1〉 According to the type of current, it can be divided into: AC arc, DC arc and pulse arc.

〈2〉 According to the state of the arc, it can be divided into: free arc and compressed arc (such as plasma arc).

〈3〉 According to the electrode material, it can be divided into: melting electrode arc and non-melting electrode arc.

2. Why does the arc voltage change when the arc length changes?

Answer: It is determined by the external characteristics of the arc welding power supply. The longer the arc, the higher the arc voltage; the shorter the arc, the lower the arc voltage.

3. What is arc stiffness?

Answer: The degree to which the arc is straight along the electrode axis under the effects of thermal contraction and magnetic contraction.

4. What is arc spot welding?

Answer: For lap joints of thin plates, a certain welding current is used to form a surface nugget within a set time to connect the upper and lower plates.

5. What is the parent metal?

Answer: The metal to be welded is called the parent metal.

6. What is a droplet?

Answer: The liquid metal droplet that melts after the tip of the welding wire is heated and transitions to the molten pool is called a droplet.

7. What is a molten pool?

Answer: The liquid metal part with a certain geometric shape formed on the weldment during fusion welding is called a molten pool.

8. What is a weld?

Answer: The joint formed in the weldment after welding.

9. What is weld metal?

Answer: The part of metal formed after the molten parent metal and filler metal (welding wire, welding rod, etc.) solidify.

10. What is a shielding gas?

Answer: The gas used during welding to protect metal droplets and molten pool from the invasion of harmful gases (hydrogen, oxygen, nitrogen) from the outside - protective gas.

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