Influencing factors of porosity in argon arc welding

17 May 2022

As we all know, argon arc welding has many advantages: 1. Good protection effect, high welding quality, no spatter, and beautiful welding seam. 2. The welding deformation is small, it can realize single-sided welding and double-sided forming, ensure the penetration of the root, and can carry out welding in various positions. 3. Various metals and alloys can be welded. How are the pores in the weld created? 1. Influencing factors of pores: the purity of argon gas, the size of argon gas flow, the size of wind speed (wind protection measures should be taken when the wind speed is > 2 m/s), the diameter of the welding torch nozzle is too small, the distance between the welding torch nozzle and the workpiece is large , The pressure in the gas cylinder is too small (the pressure should be disabled when the pressure is less than 1 MPa), the angle of the welding torch is too large, and the accessories of the welding torch are not suitable. 2. Influence of welding materials: The welding wire...

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Whether the welding shape looks good or not is related to the welding sequence

11 May 2022

The so-called welding sequence refers to which part of the welding structure is welded first and which part is welded later, or which weld is welded first and which weld is welded last, that is, the welding sequence of each weld. Improper selection of welding sequence affects the welding quality as follows: (1) The welding sequence directly affects the stress and deformation of the weldment. If the selection is improper, it will cause excessive deformation or internal stress of the weldment, which not only reduces the quality of the weldment, but also causes the weldment to be scrapped in severe cases. (2) Improper selection of assembly welding sequence often results in difficulty in welding of welds at certain positions, or even impossible to weld at all. Seriously reduce the strength or air tightness requirements of the welded structure. (3) If the welding sequence of the stainless steel welding structure is not selected properly, the working weld in contact with the corrosive medium...

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Application trend of automatic welding machine in the field of pressure vessels

07 May 2022

Pressure vessels have been widely used in many fields, the industry is also developing rapidly, and the process technology is gradually maturing. According to the development of the industry, there is also a growing demand for such products from major manufacturers. Therefore, welding technology is the most important factor in determining product quality. Then, we next analyze fully automatic welding machines in the field of pressure vessels. Welding and forming: The weld form factor is an assessment of the cross-sectional shape of the weld and refers to the ratio of the weld width (B) to the calculated weld thickness (H) of a single pass weld cross-section (φ=B/H). The welding coefficient of automatic welding machine refers to the ratio of the strength of the corresponding welded joint to the strength of the base metal. This is a comprehensive reflection of the mechanical properties of the welded joint to reflect the extent to which the strength of the welded joint is weakened due to ...

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Common Welding Defects and Causes

29 Apr 2022

Welding is a key work in the construction of large-scale installation projects. Its quality and efficiency directly affect the safe operation and manufacturing period of the project. Due to the different levels of skilled workers, the welding process is uneven, and there are many defects. The types and causes of defects are sorted out to reduce or prevent the occurrence of welding defects and improve the quality of project completion. 01. The weld size is not up to the requirements Rough welding wave, uneven shape, too low or too high welding seam reinforcement height, different welding wave width, one side of fillet welding seam or excessive sag are all unsatisfactory welding seam size. The reasons are: 1. The bevel angle of the weldment is improper or the assembly gap is uneven. 2. The welding current is too large or too small, and the welding specification is improperly selected. 3. The speed of the strip is uneven, and the angle of the welding rod (or welding handle) is improper. 0...

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Welding process and advantages of automatic butt welder

21 Apr 2022

The advantages of automatic butt welder mainly include the following 9 points. 1. Welding process: The gas shielded welding method is used, the workpiece is rotated, and multi-layer multi-pass welding is performed. 2. Unique pause function, you can weld at any time and stop at any time. 3. Welding position requirements: clamping in horizontal position, welding operation. 4. Special mechanical structure: The welding machine is firm and stable. Both sides of the device are equipped with a spindle selection mechanism and a pneumatic tailstock for adjustable tailstock movement. 5. Spindle rotation mechanism: The workpiece of the automatic welding machine is rotated by the frequency conversion motor + reducer + three-jaw clamping drive mode, the movement is stable, and the speed is stepless. The entire tailstock is guided by guide rails. 6. Welding torch moving mechanism: the cylinder is used to control the lifting and lowering of the welding torch. The electric swing welding torch has an a...

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The main factors affecting welding performance

12 Apr 2022

1. Material Factors Materials refer to the metallic materials used to manufacture the structure and the materials consumed by welding. The former is called base metal or base metal, that is, the metal to be welded; the latter is called welding material, including welding wire, flux, shielding gas, etc. Among them, the chemical composition (including the distribution and content of impurities) is the main influencing factor. In welded structures, the vast majority of commonly used metal materials are steel. Carbon has the greatest effect on the weldability of steel. The higher the carbon content, the worse the weldability. 2. Design Factors Design factors refer to the safety of welded structures in use. Not only is it affected by the material, but also to a large extent by the structural form. 3. Process factors Process factors include welding method (such as arc welding, submerged arc welding, gas shielded welding, etc.), welding process (including welding specification parameters, wel...

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