Pipe-Flange Welding Counterweight for Distortion Control
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Solution Overview
Problem
Welding distortion in flanges during the assembly of wind power generator towers is difficult to correct and results in reduced productivity and increased costs due to the need for heavy equipment and processing allowances, which degrades the structural performance.
Innovation Solution
An apparatus with a counterweight having a hollow portion to accommodate a refrigerant is used to contact and restrain the flange during welding, reducing distortion by cooling the heat generated during the welding process and applying a tension force to counteract contraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If welding is performed on a thick flange and thin pipe assembly, then structural strength is improved, but welding distortion occurs
Solution Approach 1:
A counterweight is attached to the flange assembly during welding to counterbalance the distortion forces generated by the welding process. The counterweight applies a mechanical force in the opposite direction to the expected distortion, preventing the flange from warping during welding while maintaining the required structural strength.
Solution Approach 2:
The counterweight is installed on the flange before the welding process begins. This preliminary action allows the distortion-preventing force to be applied throughout the entire welding process, ensuring that the flange maintains its proper shape from the start of welding through completion.
2Manufacturing precision
If welding distortion occurs in the flange, then dimensional accuracy is reduced, but correction by cutting requires heavy equipment and reduces productivity
Solution Approach 1:
The counterweight applies a preliminary counteracting force to prevent distortion before it occurs during welding. By anticipating and counteracting the distortion forces in advance, the flange maintains its dimensional accuracy throughout the welding process, eliminating the need for subsequent cutting corrections and maintaining high productivity.
3Shape
If a counterweight is used to prevent welding distortion, then welding distortion is reduced, but device complexity increases
Solution Approach 1:
The counterweight is designed as a simple, inexpensive, and easily removable component that is used only during the welding process. After welding is complete, the counterweight is removed and can be reused for the next assembly, keeping the added device complexity minimal while effectively preventing welding distortion.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach effectively reduces welding distortion, improving productivity and reducing manufacturing costs by minimizing the need for extensive cutting and heat treatment corrections.
Implementation Method 1
the hollow portion of the counterweight may accommodate a refrigerant
Implementation Method 2
reducing distortion by cooling the heat generated during the welding process
Implementation Method 3
applying a tension force to counteract contraction
Data Source
AI summary
The present invention relates to an apparatus for preventing welding distortion and a method for welding a pipe and a flange using same, the apparatus being capable of effectively reducing welding distortion of a flange, which occurs during welding with a pipe and improving economic efficiency and productivity. The apparatus for preventing the welding distortion comprises: at least one counterweight which is arranged to be in contact with one side of a flange that is to be welded to a pipe, and has a hollow portion therein; and a fastening tool which fixes the counterweight to the flange, wherein the hollow portion of the counterweight may accommodate a refrigerant.