The main factors affecting the welding quality of
tin wire are welding current and energization time, electrode pressure and shunt, etc.
1. Tin wire welding current and energization time
According to the size of tin wire welding current and the length of energization time, spot welding can be divided into two types: hard specification and soft specification. The specification that passes a large current in a short period of time is called a hard specification. It has the advantages of high productivity, long electrode life, and small deformation of the weldment. It is suitable for welding metals with better thermal conductivity. A specification that passes a smaller current for a longer period of time is called a soft specification, which has a lower productivity and is suitable for welding metals that tend to be hardened.
2. Electrode pressure
During tin wire spot welding, the pressure exerted on the weldment by the electrode is called electrode pressure. The electrode pressure should be selected appropriately. When the pressure is high, the shrinkage and shrinkage that may occur when the nugget solidifies can be eliminated, but the connection resistance and current density decrease, resulting in insufficient heating of the weldment, and the diameter of the weld nugget decreases. Point strength drops. The size of the electrode pressure can be selected according to the following factors:
(1) The material of tin wire. The higher the high temperature strength of the material. The greater the electrode pressure required. Therefore, when welding stainless steel and heat-resistant steel, the electrode pressure should be higher than that of low carbon steel.
(2) Tin wire welding parameters. The harder the weld specification, the greater the electrode pressure.
Full welding: also known as "full welding", it is to weld all the contact points of the two workpieces to be welded together. Operation: For example, when two steel plates are spliced together, one weld seam is fully welded, which is used for conditions requiring high welding strength.
Spot welding: The weldment is welded at individual points on the contact surface of the joint. Spot welding requires metals to have good plasticity. To give a simple example, for example, to present two metal plates at right angles, you only need to weld 2 to 3 points, that is, to weld them at a certain distance, which is spot welding.
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