Laser Weld Repair of Steel Floor Slab Root Cracks
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Solution Overview
Problem
Conventional laser welding methods are ineffective in removing deck growth cracks that pierce the deck plate, despite being able to eliminate bead growth cracks, necessitating the removal of paved portions on steel floor slabs for repair.
Innovation Solution
A repairing laser welding method that identifies the contact point between welded materials using non-destructive inspection and irradiates a laser beam along the welding bead at the root part, melting and eliminating both bead and deck growth cracks without removing the paved portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If paved portion is removed for crack repair, then both bead and deck growth cracks can be removed, but traffic regulation is required
Solution Approach 1:
The patent replaces the mechanical removal method (cutting and removing paved portions) with a non-contact thermal method (laser beam irradiation). This substitution eliminates the need for physical access to the crack location, allowing repair work to be performed through the paved portion without removing it, thereby avoiding traffic regulation
Solution Approach 2:
The patent uses the laser beam as an intermediary energy carrier that can penetrate and deliver thermal energy through the paved portion to the crack location beneath. This intermediary approach allows crack elimination without direct mechanical intervention or paved portion removal
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
The method effectively removes both bead and deck growth cracks by laser irradiation, maintaining the integrity of the steel floor slab without traffic regulation.
Implementation Method 1
melting and eliminating a crack by irradiation with a laser beam
Implementation Method 2
The irradiation with the laser beam is performed along a welding bead at the root part while the laser beam is aimed at a contact point between the first welded material and the second welded material as an irradiation point
Data Source
AI summary
Irradiation with a laser beam is performed along a welding bead, while the laser beam is aimed, as an irradiation point of the laser beam, at a contact point between a deck plate and a U-rib that is contained in a non-welded portion of a root part, from a side of the welding bead of the root part. Thereby, it is possible to remove a crack beginning at the non-welded portion of the root part generated at a joining portion between the deck plate and the U-rib of a steel floor slab, by the irradiation with the laser beam.