Mine is DNJ-25 mobile time control spot welder. The cooling water circulation is too slow. The pipe will be hot after welding for a while. The pipe is hot and cracked once. How can the cooling water circulate and flow faster? Seek expert advice. I am a bucket on the top, a barrel down the next.
Why do you have to do so much trouble? Directly with a water pump is not on the OK, in addition, the tube hot crack, it may be your transformer room, aluminum! Here's where the water leaks, not the pipe broken, but the joints are not tight!
1 circulating water plus a pump, the head is greater than the difference between high and low.2 single DNJ-25 power is not big, pipe hot crack? The controller has no response to the thyristor?3, a bucket above, below a bucket, if possible outdoor set cooling tower or outdoor, increase the volume of the bucket, often clean the pipeline, set the level of water replenishment function and regular discharge water change.Check the water separator for the total intake and return water, or the handle, the electrode, the leak point, or the replacement parts.
Welding current I Omega heat is proportional to the square of the current, so the welding current is most sensitive to the solder joint performance. When keeping other parameters unchanged, when the current is less than a certain value of nugget is not formed, more than this value, the nugget increases rapidly with increasing current, joint strength increased, and then due to increased heat and nugget growth slowed down, the shear strength increases slowly, such as to further improve the current leads to splash, solder joint strength decreased. Therefore, it is generally recommended to use the neutral current (BC segment) insensitive to the nugget diameter to weldThe welding time, t, the duration of the ohmic charge directly affect the input heat. At the current widely used control spot welding machine, the power on time is the integer multiples of the cycle. In the case of other parameters fixed, only when the discharge time exceeds a minimum value, the nugget will begin to appear, and then with the increase of the power up time, the nugget will increase rapidly first, and the tensile shear force will also increase. When the selected current is moderate, the power up time is further increased, and the nugget growth slows down and becomes constant. But because the heating time is too long, the organization is poor, pull down, the plasticity index (ductility ratio: F /F) decreased.
