Why can't lifting chains be welded?

2022-07-28 11:14

Lifting chains are important tools for lifting and carrying heavy objects. They have strong bearing capacity, wear resistance, and corrosion resistance. However, some people try to repair or connect lifting chains by welding, which is a very dangerous behavior. This article will analyze the impact of welding on the structure of lifting chains, the thermal stress generated by welding, and the potential safety hazards caused by welding, to explain why lifting chains cannot be welded.

First of all, the welding of lifting chains will have an irreversible impact on their structure. During the welding process, the chain will be affected by high temperature and heat, thereby changing its organizational structure and performance. Especially for alloy steel chains, welding will cause problems such as grain coarsening, reduced hardness, and increased brittleness, making it prone to breakage and deformation during use. Therefore, once the lifting chain is welded, its bearing capacity and safety will be greatly reduced.

Secondly, the thermal stress generated by welding is also one of the reasons why lifting chains cannot be welded. During welding, the chain will expand locally due to the high temperature, and will shrink again when cooled, thereby generating residual stress in the chain. This residual stress will cause deformation and distortion of the chain, which will affect its normal use. Especially in lifting operations, the weight carried by the chain will bring greater load to the chain, and the residual stress may cause fatigue damage to the chain, resulting in serious safety accidents.

In addition, welding lifting chains may also cause other safety hazards. Due to the uncertainty of welding technology and welding quality, welding parts are prone to quality problems such as welding slag, pores, and cracks. These defects will gradually expand during use and eventually lead to chain breakage. Once the chain breaks, the weight carried will suddenly fall, causing serious personal injury and property loss. Therefore, in order to avoid this danger, the lifting chain should not be welded.

In summary, the lifting chain cannot be welded based on comprehensive considerations of the impact of the chain structure, the generation of thermal stress, and safety hazards. In order to ensure the safety and smooth progress of the lifting operation, the user should always pay attention to the condition of the lifting chain, replace the severely worn chain in time, and it is strictly forbidden to use welding to repair the chain. Only by maintaining the integrity and original performance of the chain can the smooth progress of the lifting operation be ensured and unnecessary personal injury and property loss can be avoided.