How to determine if a 3D welding workbench is severely deformed?

I. Core Criteria for Judging Severe Deformation (Based on Measurement Data)

The following are quantifiable key indicators. Exceeding these standards indicates that the deformation has reached a level requiring immediate intervention:

1. Flatness Error Exceeding 0.1mm/m: Using an electronic level or multi-point laser measurement, a flatness deviation greater than 0.1mm per meter of the platform indicates severe overall flatness inaccuracy, affecting the welding torch positioning accuracy.

2. Key Positioning Hole Coordinate Deviation ≥ ±0.15mm: Using a coordinate measuring machine (CMM) to check the position of the reference holes, if the spatial coordinate offset exceeds ±0.15mm, it will cause the fixture to fail in repeated positioning, which is a structural inaccuracy.

3. 3D Scan Deviation Cloud Map Showing Local Unevenness Exceeding 0.2mm: Comparing a handheld laser scan with the original CAD model, if local bulges or depressions exceed 0.2mm, it easily causes gaps or compression in the weld bead initiation layer, indicating severe local deformation.

4. Laser tracker detects an overall torsion angle ≥0.05°. For large splicing platforms, a torsion angle exceeding 0.05° per unit length will cause robotic arm path deviation and stress concentration, affecting structural safety.

II. Typical External Manifestations of Severe Deformation When the following phenomena occur, it often means that the deformation has developed to the point of affecting production:

1. Multiple consecutive batches of weld bead misalignment or first-layer cladding failure, which cannot be resolved after ruling out program and equipment malfunctions.

2. Repeated difficulties in hole alignment, forced bolt assembly, or clamping failure in the same fixture, reflecting severe distortion of the hole system reference.

3. Frequent triggering of robotic arm limit alarms or slide rail jamming during welding, indicating that the platform is uneven and causing motion interference.

4. Significantly increased deformation under hot conditions: Qualified at room temperature but a sharp drop in welding accuracy after heating, indicating that the thermal expansion compensation mechanism has failed.

III. Identification of Special Risks under High-Temperature Conditions (Specifically for Dyeing) (Coloring Machine Matching Scenarios)

Due to prolonged exposure to high temperatures, special attention should be paid to the following progressive and severe deformation characteristics:

1. Cumulative plastic deformation due to thermal cycling: After hundreds of temperature increases and decreases, the platform exhibits irreversible warping, which cannot be fully restored by cold-state leveling.

2. Angular deformation caused by non-uniform thermal expansion: One side experiences stronger impact from hot airflow, resulting in a difference in unilateral expansion and forming a "warp effect."

3. Slow deformation caused by residual stress release: The internal stress of the material redistributes over time, manifesting as periodic accuracy drift.

It is recommended to conduct a hot-state retest when the equipment reaches a stable operating temperature (e.g., above 80°C) to accurately reflect the degree of deformation under service conditions.