Large metal sculptures are prone to stress-induced cracking due to thermal expansion, welding imperfections, and material fatigue. To mitigate these issues, artists and fabricators should adopt the following best practices:

1. Material Selection: Choose alloys with high ductility and low thermal expansion coefficients, such as stainless steel or bronze, to reduce internal stress.

2. Design Optimization: Incorporate flexible joints and gradual curves to distribute stress evenly, avoiding sharp angles that concentrate tension.

3. Controlled Welding Techniques: Use pre-heating and post-weld heat treatment to minimize residual stresses from welding.

4. Thermal Management: Install expansion joints or allow for natural movement in outdoor installations to accommodate temperature fluctuations.

5. Regular Maintenance: Inspect sculptures for early signs of micro-cracks and address them promptly to prevent propagation.

By combining these strategies, artists can enhance the longevity and structural integrity of their metal sculptures.