An oxyacetylene welding operation is used to weld a corner joint formed by two (7.5-mm) thick low-carbon steel plates. A fillet weld is made in the joint, adding filler metal of the same thickness. What is the purpose of the fillet weld in this welding operation?
1) To provide additional strength to the joint
2) To prevent corrosion in the joint
3) To improve the appearance of the joint
4) To reduce the heat affected zone