How the welding thickness different between butt welding and vertical welding

How the welding thickness different between butt welding and vertical welding

Brief introduction:

Recently the handheld laser welding machine is widely used in sheet metal industry, furniture industry and hardware industry,etc.

Applicable materials are: Stainless steel, mild steel, carbon steel, iron, aluminium, brass, galvanized sheet, round or cubic pipes, etc.

95% of the customers use this machine to do butt welding and 90° vertical welding. 5% of the customers used to weld round & cubic pipes. 

Different laser power that used to weld different thickness, so far, we have 500W, 1000W and 1500W laser power available. 

How the welding thickness different between butt welding and vertical welding? 

From the picture:

From the welding parameters