This is a highly fractionated two-level factorial design employed as a screening design
in an off-line welding experiment performed by the National Railway Corporation of Japan.
There were 16 runs and 9 experimental factors. The response variable is the observed
tensile strength of the weld, one of several quality characteristics measured. All other
variables are at plus and minus levels.
Usage
data(welding)
Format
A data frame containing the following variables.
All the explanatory variables are numeric with two levels, -1 and 1.
Variable
Description
Rods
Kind of welding rods
Drying
Period of drying
Material
Welded material
Thickness
Thickness
Angle
Angle
Opening
Opening
Current
Current
Method
Welding method
Preheating
Preheating
Strength
Tensile strength of the weld in kg/mm. The response variable.