In the process of cutting and assembling stainless steel when making a stainless steel decorative ball, you should be more careful than cutting and assembling carbon steel. Carefulness during the welding preparation process can improve the quality of the weld and the final product, so that the product has better reliability in use.
In addition to oxyacetylene flame cutting, the way to cut carbon steel can be also applied to cut stainless steel. Oxyacetylene flame cutting of stainless steel (without iron-rich powder additives) will form refractory chromium oxide, which will make the cut uneven.
The thickness and opening of the parts to be cut or to be welded determines which method is more suitable in a large scale. The design of stainless steel welded joints is similar to that of ordinary steel welded joints. The selected welding joint design must ensure that the weld has proper strength and service life, and at the same time, the welding cost should be low.
Fillet welds do not need to be fully penetrated, as long as the two sides or both ends are welded well to seal the gaps caused by the accumulation of liquid to cause crevice corrosion.
Fillet welding the branch joints on the header creates a large and serious gap in the inner diameter. This kind of crevice will cause crevices and microbial corrosion, which is strictly prohibited when assembling stainless steel decorative balls for various purposes.
Compared with carbon steel, the fluidity of molten stainless steel weld metal is deviated, and the weld penetration depth is not deep. In order to make up for these defects, stainless steel welded joints have larger grooves, thinner welding areas and wider root gaps.
The welding process also has an impact on the better joint design. For example, the penetration depth of arc spray gas shielded metal arc welding is deeper than that of short-arc gas shielded metal arc welding, so the welding zone used in the former process is thicker than the latter.
The area of the weld to be cleaned includes two or three inches from the edge of the joint and nearby surfaces. Poor cleaning will cause weld defects such as cracks, blisters or incomplete penetration. If foreign matter remains on the surface before welding or heat treatment, the corrosion resistance of the weld and heat-affected zone will be significantly reduced.
After cleaning, welding should be carried out quickly, otherwise the joints should be covered. The joints to be welded should be free of the surface oxides normally left after thermal cutting.