Understanding Weld Bead Geometry
Weld bead geometry (width, depth, shape) affects joint strength, appearance, and process stability. Proper control supports repeatable trials and makes inspection results easier to compare.
Aspect Ratio Significance
- High Aspect Ratio (> 1.5): Deep, narrow welds. Good penetration, keyhole mode, may have porosity risk
- Balanced (1.0-1.5): General-purpose planning range; confirm stability with trial welds
- Low Aspect Ratio (< 1.0): Wide, shallow welds. Good for thin materials and surface sealing
Controlling Weld Width
- Focus Spot Size: Smaller spot = narrower weld
- Power Density: Higher density creates keyhole mode (narrow weld)
- Welding Speed: Faster speed reduces width but may sacrifice depth
- Defocus: Moving focus above/below surface increases width
Material Effects
High thermal conductivity materials (aluminum, copper) produce wider welds due to heat spreading. Low conductivity materials (stainless steel, titanium) concentrate heat for narrower welds.