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Tagalog Welding speed too fast or too slow can lead to different defects in the weld seam. The following is a detailed explanation of these defects:
Defects that may be caused by excessive welding speed:
1. * * Incomplete penetration * *: When the welding speed is too fast, the heat input is insufficient, causing the base material and weld metal to not completely melt, resulting in the weld not fully penetrating the base material and forming incomplete penetration defects.
2. * * Welding cracks * *: Excessive welding speed may cause excessive shrinkage stress in the weld during rapid cooling, thereby increasing the risk of welding cracks.
3. * * Pores * *: Due to the welding speed being too fast, the protective gas may not be able to effectively eliminate air and impurities in the weld, resulting in the appearance of pores in the weld.
Possible defects caused by slow welding speed:
1. Overheating and burning through: Slow welding speed can cause excessive heat input, resulting in excessive melting of the base material, especially during thin plate welding, which may lead to burning through.
2. Expansion of heat affected zone: Slow welding speed can increase the width of the heat affected zone, which may lead to coarse grain size of the base material and affect the mechanical properties of the weld.
3. * * Inclusion * *: Slow welding speed may cause incomplete flipping of welding slag in the weld seam, resulting in slag inclusion defects.
4. * * Weld deformation * *: Slow welding speed can increase the width of the heat affected zone of the welded joint, leading to uneven shrinkage of the weld metal during the cooling process and increasing the risk of welding deformation.
Therefore, in order to obtain high-quality welds, it is necessary to choose an appropriate welding speed to avoid various defects caused by being too fast or too slow. At the same time, attention should also be paid to the selection of other welding parameters, such as welding current, arc voltage, protective gas flow rate, etc., to ensure the stability of the welding process and the quality of the weld seam.