• June 21, 2024
  • Shatou, Changan, Dongguan, CN
Sheet metal welding

Sheet metal welding: Common methods and techniques of welding

Sheet metal welding is a complex process involving a variety of techniques and requires the proper knowledge and skills to get the best results. By using welding work, sheet metal welding is a great way to save time on a project.

This article details the various methods used to weld sheet metal, including their common approaches and techniques. In addition, it provides important tips for welding thin sheet metal to get the best results.

Commonly used sheet metal welding methods

1, Gas welding

Using gas as fuel such as oxyacetylene welding, hydrogen welding, acetylene welding, etc., the workpiece and filler material are heated by flame to melt and form the welding seam.

2, Electric arc welding

Using steel, copper wire, etc. as filler material, the workpiece and filler material are heated by an electric arc to melt and form a weld seam.

3, Laser welding

Using a laser beam to heat the workpiece and filler material to melt and form a weld.

4, Resistance welding

Using electric current through the workpiece, a region of high current density and high temperature is formed on the contact surface of the workpiece, causing it to melt and form a weld.

Commonly used sheet metal welding techniques

1, Clean the surface of the sheet metal parts before welding to ensure the quality of the weld seam.

2, Protect your eyes, face, respiratory tract, etc. from light-arc radiation and harmful substances generated by gases when welding.

3, Control the parameters of current, voltage, welding angle and speed when welding to ensure a uniform and solid weld.

4, polish and refurbish the sheet metal surface after welding to achieve a beautiful and anti-corrosive effect.

Preparation work before preparing the weld seam

1, Clean the welded area and remove oil, corrosion and rust from its surface.

2, Preheat the workpiece to make its temperature uniform and to reduce the stresses generated during welding.

3, Confirming the welding position and method, and ensuring the quality of the equipment and welding materials.

4, Preparing the filler material and performing the necessary handling and baking.

5, Determining the size, depth, angle and shape of the weld seam and making the necessary design and measurements.

Common problems in the welding process and solutions

1, Poor quality of the weld

It may be the result of poor quality welding materials or equipment, or unskilled welding techniques. Good quality welding materials and equipment should be selected to improve the technical level.

2, Poor control of welding temperature

It may be that the preheating is not sufficient, or the temperature is not monitored in real-time during the welding process. The welding temperature should be controlled according to the material properties and welding requirements.

3, Decrease in size after welding

It may be due to factors such as too much moisture or the presence of pressure. Should be kept dry and pressurized during the effective period of welding and check the quality of the welded joints.

Quality control and inspection methods

1, Visual inspection

Observe the weld area with the naked eye or magnifying glass to check whether the shape, size and shape of the weld meet the standard.

2, X-ray inspection

Judge the quality of the welded part by focusing on X-ray photos in order to find some cracks and defects.

3, Ultrasonic inspection

Emitting ultrasonic waves through the probe and detecting whether there is any problem in the welding part through the reflected waves.

4, Magnetic powder inspection

By spraying magnetic powder in the welding area, check the distribution of magnetic powder in order to find some defects.

Summarize

Sheet metal welding needs to choose the appropriate welding method and material, control the welding current and time, choose the appropriate welding position, and keep the welding equipment in good condition. High-quality sheet metal welding can be obtained through reasonable welding operations and skills.

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