Table 2 Image acquisition.

From: Defects detection of GMAW process based on convolutional neural network algorithm

Image library

Classification

Number of experiments

Number of images

Penetration

Full penetration

15

1650

Sag depression

30

1850

Burn through

15

1400

Pores

With pores

25

1350

No pore

15

1050

Arc interference

Strong interference

100

10,000

Weak interference

10

5300

Slags

With slags

15

2250

Little slag

25

1950