Sheet Metal Welding

Custom sheet metal welding is to weld multiple sheet metal parts together to achieve the purpose of processing or single parts edge seam welding to increase its strength.

The sheet metal fabrication welding often uses oxygen arc welding, resistance spot welding, carbon dioxide gas shielded welding and manual arc welding. The specific welding process selection and scheme formulation need to be combined with the material, shape and use of sheet metal parts for specific consideration. When selecting the process of sheet metal fabrication welding, the technical requirements should be put in the first place, and the processing and manufacturing costs should be properly considered. In the actual sheet metal welding process, carbon dioxide gas shielded welding and argon arc welding are the most commonly used welding. Because the welding effect of sheet metal materials is limited by the welding equipment to a certain extent. For this reason, sheet metal parts should be selected with a thickness of less than two millimeters. The splicing process before welding should be prepared in advance for subsequent welding work. In the key parts of the welding machine tool, the plate needs to be fully aligned, and after ensuring that the surface is flat and there are no gaps, continuous spot welding is adopted. After the welding is completed, the seam is treated with sheet metal glue for waterproofing. If thicker materials are encountered and there are technical requirements such as full welding, the corresponding current and voltage need to be adjusted, and the welding sequence of the corresponding operation is adjusted by segmented full welding. For the welding of sheet metal parts for different purposes, there may also be certain processing technology and process differences. For example, for sheet metal parts that require high tightness such as fuel tanks. In order to avoid welding defects, it is necessary to use an open groove in the flat welding position to weld full. After the welding is completed, polish and smooth and timely oil leakage detection.

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Sheet Metal Welding Process

1. Put the workpiece in the accurate position according to the requirements of the drawing, and then weld it after the measurement is qualified. If necessary, with the help of tire fixtures;

2. Try to use flat welding when welding, if welding in other positions, the welding current should be adjusted to reduce it by 10% than the flat welding current;

3. During the welding process, it is necessary to measure whether the size meets the requirements at any time to prevent the deformation;

4. When the weld is long or the structure is assembled, it should be fixed by spot welding in sections and then welded to avoid deformation;

5. The arc pit should be filled when closing the arc, and the maximum arc pit should not exceed 5mm;

6. After welding ,knock out the chemical skin, clean the welding tumor and welding slag, and ensure that the weld seam is smooth and clean;

What Are The Advantages And Disadvantages Of Welding In Sheet Metal Fabrication Services

The advantages of Welding:

The welding process is a sheet metal fabrication process that is easy to mechanize and automate in processing.

Sheet metal welding simplify the processing and assembly, improve the sheet metal production efficiency.

Provide greater flexibility in structural design;High structural strength and good joint sealing;

Save a lot of metal materials, welded sheet metal parts reduce the weight of the component and increase the material usage to greatest extent, reduce product cost.

The tightness and waterproof performance of the welding of sheet metal parts have been significantly enhanced.

The Disadvantages of Welding:

High temperature, strong light and some toxic gases are produced in welding, which has certain damage to the human body, so it is necessary to strengthen labor protection.

The welded joint has a large performance inhomogeneity, due to the different composition and metallographic structure of the weld and the base metal, the thermal cycle experienced by each part of the joint is different, so that the performance of the joint in different areas is different;

The welding structure is easy to cause large residual deformation and welding internal stress. Since most welding methods use local heating, the welded parts after welding will inevitably stress and deformation in the structure, thereby affecting the bearing capacity, processing accuracy and dimensional stability of the structure. At the same time, it will also cause stress concentration at the junction of the weld and the weldment, affecting the brittle fracture of the structure;

There are a certain number of defects in welded joints: such as cracks, pores, slag inclusions, not welded through, not fused, etc. Defects can reduce strength, cause stress concentration, and damage weld compactness;