How is the welding preparation of stainless steel decorative ball?
stainless steel should be more cautious than cutting and assembling carbon steel in the assembly process of cutting. Care in the welding preparation process can improve the quality of welds and final products, so that the products have better service reliability. In addition to oxyacetylene flame cutting, stainless steel can be cut by cutting carbon steel. Oxyacetylene flame cutting stainless steel (No iron-rich Powder additive) It will form melt-resistant chromium oxide, make the incision uneven, and the thickness and opening of the parts to be cut or prepared for welding determine which method is more suitable in a large procedure. The design of stainless steel welded joint is similar to that of ordinary steel welded joint. The selected welding joint design must have appropriate strength and service life of the weld seam, and at the same time, the welding cost should be low. Butt welds used in corrosion purposes shall be full melt welds. There is no need for full penetration of fillet welds, as long as both sides or both ends are welded and the gaps caused by crevice corrosion caused by accumulated liquid are sealed.
Fillet welding of the branch pipe joint on the joint pipe box causes a large and serious gap in the inner diameter. This kind of gap can cause gap and microbial corrosion. When assembling stainless steel decorative balls for various purposes, the above situation is strictly prohibited. Compared with carbon steel, the fluidity deviation of molten stainless steel weld metal and the weld penetration depth are not deep. In order to make up for these defects, the groove of the stainless steel welded joint is larger, the welding area is thinner, and the root clearance is wider. Welding process also has influence on better joint design. For example, the penetration depth of gas shielded metal arc welding sprayed with arc is deeper than that of short arc gas shielded metal arc welding, therefore, the welding area used in the former process is thicker than the latter. The weld area to be cleaned includes the joint edge and two 3 inch of the nearby surface. Poor cleaning will cause weld defects such as cracks, sand holes or incomplete welding. If foreign matter remains on the surface before welding or heating 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 joint must be covered. The joint to be welded shall have no surface oxide normally left after thermal cutting.
stainless steel oxides are mainly oxides of chromium and nickel. Since the melting temperature of these oxides is higher than that of weld metal, they cannot melt during welding. Usually, in solidified welds, oxide films become entrained and become defects that are difficult to detect by rays. This is different from carbon steel welding. When welding carbon steel, the melting temperatures of iron oxide and weld metal are basically the same. When welding on steel with thicker scale, there will be no problems caused by stainless steel oxide film. The difference between melting temperatures of metals and metal oxides is as follows. Generally speaking, there is no harmful oxide on the stainless steel forgings delivered by steel mills, so no special treatment is required before welding. The oxide layer is thin and generally does not cause welding problems. Very thin metal, like 0. For strip steel below 25mm, it may need to be honed with air spray abrasive because thin oxide film will be entrained in small quick setting welds.
In general, stainless steel decorative balls that have been in use need to be cleaned before welding. If the alloy has been exposed to high temperature, the surface is usually severely oxidized, or there is a carburized layer or a sulphurized layer. Must be removed by grinding or machining. The firmly adhered oxide cannot be removed with a wire brush. Stainless steel equipment that has been used in chemical industry may have been contaminated by product Media. For example, contaminated by hydroxide. If there is hydroxide on the surface of the welding process, cracks will occur in the weld and heat affected zone. Before welding, neutralization of hydroxide residue in acid solution is one of the effective cleaning methods. Neutralization is a good method before repairing and welding the equipment. That is to say, the surface polluted by acid in mild alkaline solution and the surface polluted by alkali in mild acidic solution are used. After neutralization treatment, it should usually be rinsed with hot water.
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