How to control the quality of the frame welding process？

The grooves at both ends reduce the influence of stress concentration on dynamic loads. After the weld is formed, the two ends can be left on the weldment unless it does not affect its use. Otherwise, it should be cut off after welding. Fillet weld: The edges of the connecting plates do not need to be finely processed, the plates have no gaps, and the weld metal is directly filled in the right angle or bevel area formed by the two weldments. The size of the right angle side in the right angle weld is called the weld leg size, and the size of the smaller side is represented by hf. To ensure the quality of the weld, it is advisable to choose a suitable weld angle size. If the weld leg size is too small, the weld will not be strong, especially when the weldment is too thick, it is easy to crack; if the weld leg size is too large, especially when the weldment is too thin, it is easy to burn through. In addition, when the edge is welded, it is easy to produce undercutting.

1. The frame welding must ensure symmetry, balance, and verticality, and be made according to the size requirements of the drawing.

1. During welding, the welding surface should not have defects such as false welding, pores, slag inclusions, cracks, weld nodules, burn-through, arc pits, undercuts, electric welding scratches, and incomplete welding. The welding should be uniform and beautiful;

2. The surface should not be uneven after welding;

3. The surface of the fuselage must be polished and smooth, and the welding slag must be cleaned;

4. After welding, the welding slag must be cleaned inside, and the surface must be polished and smooth;

5. The production of the guide groove must be consistent with the opening and closing pages, and the surface must be flat. There should be no high and low, one opening and one closing.

2. The bending of sheet metal parts must be made according to the requirements of the drawings. The arc must be smooth, and the bending surface must be flat. There should be no unevenness. The dimensional symmetry, parallelism, and verticality must be guaranteed.

3. Post-welding treatment

1. After welding, the slag splash on the surface of the weld should be cleaned, and the external dimensions and appearance quality of the weld should be checked. If the weld is uneven, it should be trimmed.

2. The weld shape should be smooth and uniform, and the transition between welds and between welds and base metal should be smooth.
3. For some closed structures, components with multiple welds and long welds, residual stress should be eliminated by hammering, vibration, and other methods after welding. If the parts require heat treatment, heat treatment should be used to eliminate stress.