Why do my screens crack at the welds or deform under load?

The symptom

Cracks start at weld points or clamped edges of screen decks, baskets and support screens. Apertures stretch out of tolerance in the loaded zone, product quality drifts, and the same repair returns every few months.

Root causes

1. 01 Woven mesh doing a structural job: under point loads the weave shifts, apertures open and the mesh work-hardens exactly where it flexes most.
2. 02 Stress concentration at hard transitions: a weld or clamped edge without load spreading concentrates every vibration cycle on a few millimetres of material.
3. 03 Perforation margins too small: holes placed too close to the edge or the weld line leave no solid material to carry the load path.
4. 04 Resonance: a deck or basket running near its natural frequency multiplies the load cycles the design never counted.

The mesh solution

• ▸ Give the structural job to welded mesh: a weld at every crossing keeps apertures constant under load; the fine retention layer, if needed, rides on top as a separate medium.
• ▸ Composite screens: fine woven cloth mechanically bonded to a welded backing splits the roles, retention above, strength below.
• ▸ Redesign the margins: unperforated borders and load-spreading edge profiles sized to the actual mounting, not to the catalogue default.
• ▸ Match plate thickness, hole pattern and open area to the load case; the pattern formulas make this a calculation, not a guess.

Prevention

• ⊕ Specify the load case (static, vibrating, point loads) in every screen RFQ; retention alone under-specifies the part.
• ⊕ Inspect weld zones and edges at fixed intervals; cracks grow from the same initiation points every time.
• ⊕ When a repair repeats, stop repairing and redesign: the third identical crack is a design message, not bad luck.