When installing bolt heating rods on site, if they are directly connected to ordinary AC power, uneven heating and inconsistent thermal deformation of bolts often occur. Comparative analysis shows that using a matched DC adjustable control cabinet can better meet the heating needs of bolts of different specifications.
Heating Power Supply: Differences Between DC Adjustable and Direct Connection
A DC adjustable control cabinet can smoothly adjust the output voltage or current, so that the heating rod power corresponds to the bolt specifications. When directly connected to a fixed power supply, the power is not adjustable, which can easily cause overheating of small-specification bolts or insufficient heating of large-specification bolts, affecting the pre-tightening effect.
Selection Parameters: Bolt Specifications Determine Heating Rod Dimensions
Before purchasing, it is necessary to confirm the bolt specifications (such as M56×4, M85, etc.), center hole diameter, and length. These parameters directly affect the diameter, length, and power of the heating rod. When the center hole diameter and length do not match, the heating rod cannot effectively transfer heat, or may even fail to be inserted.
Material Compatibility: Adaptation Requirements for High-Temperature Alloy Bolts
For high-temperature alloy bolts, it is necessary to confirm whether the heating rod shell material is compatible with the bolt material, to avoid element diffusion or electrochemical corrosion at high temperatures. The stability of different material combinations at high temperatures varies greatly, and compatibility statements should be requested from suppliers during selection.
Control Method: Impact of Adjustable Cabinets on Procurement Costs
The initial investment of a DC adjustable control cabinet is higher than that of a fixed power supply, but it can cover multiple bolt specifications and reduce bolt scrapping or rework caused by improper heating. Procurement personnel should evaluate the matching scheme comprehensively based on the range of bolt specifications and frequency of use.
