Optimization and Prediction of Ultimate Tensile Strength in Metal Active Gas Welding

Table 2

Welding input parameters and their levels.

Number	Parameter	Unit	Notation	Low level (−1)	High level (+1)
1	Wire feed rate	m/min		7	19
2	Welding voltage	Volt		20	30
3	Welding speed	mm/min		200	500
4	Travel angle	Degree		60	80
5	Tip-to-work distance	mm		7	15
6	Shield gas flow rate	Liter/min		10	20