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The Basic Problems And Simple Solutions Of Spot Welder
Aug 31, 2018

What is welding?
Answer: The way in which the same or different metals are heated or preloaded to achieve metal bonding is called welding.
1. Why do we have to formulate welding procedure before welding? Answer: ensuring welding quality depends on five main control links: man, machine, material, method and ring. Operator skills and experience machine for welder

High Performance and Stability of Welding Equipment High Quality Method of Welding Materials Correct Welding Procedures and Standardized Work Ring Good Welding Working Environment

According to the welding test and welding procedure qualification, the welding procedure regulation is the law and the important factor to ensure the welding quality.
2. Why should the surface treatment of the base metal be processed before welding? Answer: If the base metal surface is not treated before welding, the oxides on the base metal surface will bring harm and hidden danger to the welded joint.
3. What is the melting coefficient of welding wire? Answer: the melting coefficient of the welding wire refers to the melting amount of the welding wire when the unit current is passed per unit time. (g/Ah) the thinner the welding wire is, the greater the melting coefficient is, and the more efficient it is.

The higher.
4. What is welding parameter? Answer: Before welding process parameters will be set, a high quality welding point is inseparable from the process parameters (for example: welding current, arc voltage, welding)

A general term for speed, line energy, etc.
5. What is welding current? Answer: when welding, the current flowing through the welding loop is usually indicated by ampere (A).
6, what is arc voltage? Answer: the voltage drop between the two ends of the arc (two electrodes) is usually expressed in volt (V).
7. What is welding speed? Answer: the length of weld seam per unit time is usually expressed in centimeters / minutes (cm/min).
8, what is dry extension length? Answer: when welding, the distance between the end of the welding wire and the end of the nozzle.
9. What is welding line energy? Answer: when welding, the heat input from the welding heat source to the weld length of the unit length is also called thermal input. Generally, Joule / cm (J/cm) is used.

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10. What is the fusion ratio of weld metal? Answer: the proportion of the molten base metal in weld metal during fusion welding.
11. What is the shape factor of weld? Answer: when welding, the ratio of weld width to weld thickness on the cross section of single weld.
12, what is left-hand welding? Answer: when welding, the welding torch moves from the right end of the weldment seam to the left side. The gas protection effect is good and the weld shape is beautiful. Both CO2 and TIG welding are left side welding.

MIG welding aluminum must be left side welding.
13. What is the right-hand welding method? Answer: when welding, the welding torch moves from the left end of the weldment joint to the right side.
14. What is called parent material?
Answer: the welded metal is called base metal.
15. What is weld metal?
Answer: some metal formed by solidification of molten base metal and filler metal (welding wire, electrode etc.).
16. Why is welded joints a weak link in welded structures? Answer: Because of the inhomogeneity of the microstructure and properties of the welded joints, there are often some welding defects and there is a higher level of them.

Tensile residual stress, so welded joint is a weak link in welded structure.
17, why do we get quality welding joints through process? Answer: To improve the quality of welded joints, we can proceed from the following ways: the correct selection of welding materials, the use of a reasonable welding process.

Methods: Controlling fusion ratio, adjusting welding thermal cycle characteristics, using reasonable operation methods and groove design, supplemented by preheating, interlaminar insulation, slow cooling, post-heating and other measures, or post-weld heat treatment methods, etc.