Spot welding: on porous materials is less than 5 mm and the local weld repaired, available extrusion melting welder welding.
Affix: on insufficient thickness or lax extrusion welds, available extrusion welding machine welding layer.
Patch: defect cause of large holes, thorn, the membrane surface of serious damage, sampling, cross stitch cross and other various factors, can all be stamped with the patch method to repair.
Patch size: cross joints for the square cut angle of 300 * 300 mm or D=300 mm. The rest of the situation, the general length of not less than 200 mm, margin defects patches of not less than 80 mm.