How is corrosion at the welds of a tower usually repaired?

Grind it off and weld it again. -----------------

What was said upstairs is probably correct. I’m an amateur too; we need to consider the thickness of corrosion, and moreover it’s important to find out the cause of it

1. When performing repair welding for defects, it is advisable to use a low current, avoid movement during welding, and apply multiple layers of welds; the use of an excessive current for repair welding is prohibited. If the material and operating conditions are special, inert gas shielding is also required to prevent excessive oxidation at the weld site from affecting the quality. 2. When performing repair welding on structures with high rigidity, high-efficiency welding techniques can be used alongside hammering of the weld area to relieve stress; however, this cannot be done for the first and last layers of weld metal, as the first layer is thin and prone to cracking, while the last layer affects the appearance. 3. The start and end points of each weld pass should be staggered as much as possible, and not at the same location. 4. For materials that require preheating, corresponding preheating measures should be taken when the working environment temperature is below 0°C. 5. For weldments that require heat treatment, defects should be corrected prior to the heat treatment. 6. When repairing weld defects in Grade D, Grade E steel, and high-strength structural steel by manual arc welding, a method of controlling wire energy should be employed. Each defect should be repaired by welding in one go; no interruptions are allowed. Both the preheating temperature and the interlayer temperature should be maintained above 60°C. 7. Eliminate and repair weld defects; it is not allowed to carry out these operations under pressure or with water against the weld. 8. The repaired welds shall be re-inspected in accordance with the inspection requirements for the original welds. If defects exceeding the allowable limits are detected again, rewelding shall be carried out until they meet the standards, and the number of rewelding attempts shall not exceed the specified limit for repairs.