Stainless steel is a kind of widespread in the production of my life, with the expansion of the stainless steel market in China, the consumption of the stainless steel plate also increased year by year, stainless steel sheet has been deep into the various manufacturing field, stainless steel sheet is weak media

such as air, steam and water corrosion resistance of steel, acid steel plate is refers to the chemical etching media such as acid, alkali, salt corrosion of the steel plate. Especially in the decoration, stainless steel sheet is often used. When mesa of ambry inside the kitchen decorates for instance, can choose to

use stainless steel sheet, and also can choose stainless steel sheet when the production of a few doors. The surface of stainless steel sheet is bright and clean. It has high plasticity, toughness and mechanical strength. It can resist the corrosion of acid, alkaline gas, solution and other media. It is an alloy steel

that does not rust easily, but not without rust. Nowadays, the welding of stainless steel sheet has become an important process in manufacturing, for the stainless steel sheet welding related content, do you want to know more? The following xianji network small code to introduce the stainless steel sheet

welding method, welding notice, the generation of welding stress and eliminate welding stress method, welding easy to burn through and deformation solutions, welding quality impact analysis.

t018897864769ed36fe.jpg

Stainless steel sheet welding method

 

Manual arc welding, submerged arc welding and carbon dioxide gas shielded welding are recommended for the welding of the base. Welding of cladding and transition layers shall be by argon tungsten arc welding and manual arc welding, or by other welding methods which can ensure the welding quality. When the condition is limited, can also be used to weld cladding, welding transition layer and the base again, in this case, if the thickness of the composite board is less than 10 mm, base welding can be directly the same welding material selection and the transitional layer, if the thickness of the composite board is more than 10 mm, then can be appropriately increase the thickness of transition layer welding welding (transition layer thickness should be greater than or equal to 5 mm), the carbon steel or low alloy welding at the grass-roots level. Welding should first welding base, then welding transition layer, finally welding layer.

 

1. Welding of the base

  The base weld pass shall not touch or melt the composite material. When the base material is welded first, the root or surface of the weld pass shall be 1-2mm away from the composite interface. The residual height of the weld shall conform to the relevant standards. Depending on the substrate thickness, steel type and structure, appropriate preheating treatment can be used when necessary.

 2. Welding of transition layer

 When welding transition layer, it is necessary to reduce the melting amount of base metal and reduce the melting ratio on the premise of good fusion. For this purpose, a smaller diameter electrode or wire and a smaller welding line energy should be used. The thickness of the transition layer shall not be less than 2mm.

 3. Welding of cladding

 When welding the cladding layer, pay attention to protect the surface of the cladding layer, prevent welding spatter from damaging the surface of the cladding layer, do not randomly start the arc on the surface of the cladding layer, welding karan, lifting ring and temporary support, etc.. The weld surface of cladding should be as smooth and smooth as possible with the cladding surface. The residual height of butt weld shall not exceed 1.5mm.

Notice for stainless steel sheet welding

 1. Because the plate is relatively thin, it is easy to produce welding deformation, and for longer welding seams, it is easy to produce wavy deformation. Therefore, it is necessary to strictly observe the welding process during welding, especially to strictly control the welding current (try to use a small welding current in the case of ensuring the penetration) and the welding sequence. The welder should check the wrong side of the groove before welding. Only after the wrong side is qualified can the welding be performed. For girth weld of larger diameter tank, try to weld symmetrically and segment weld, according to schematic diagram 5:

 Welding method and notice of stainless steel sheet

 2. The back side of all welding seams welded by manual argon arc welding must be protected by Ar. For spot welds (especially prone to incomplete fusion and incomplete welding), welding requires the same as welding and try to weld thoroughly once, otherwise should be polished before welding. If the tank volume is large, it can be filled with part of water according to the schematic diagram and then inflated to save argon gas, as shown in schematic diagram 6.

 Welding method and notice of stainless steel sheet

 3, for the part of the tank without manhole, as far as possible before welding closed seam, the tank on the need for double-sided welding or back to gas protection accessories (such as pipe and backing plate) welding.

 4. The accessories on the welded shell such as lifting lug, backing plate and supporting rib should be welded according to the minimum welding foot size, and water should be poured on the back of the welding seam as far as possible to reduce deformation.

 5. If there are too many welding accessories on the shell, spot welding shall be performed before welding, and the reinforcement shall be welded as the case may be.

 6. Plasma or grinding wheel should be used when removing arc starting and arc backing plate and reinforcing rib, and it is not allowed to be knocked out forcefully.

 The generation of welding stress in stainless steel sheet and the method of eliminating welding stress

 1. The quality control of sheet metal welding deformation lies in plate cutting, clamping, spot fixation, welding and post-welding treatment; The welding method and effective deformation control measures should be considered.

 Welding method and notice of stainless steel sheet

 2. Select appropriate methods for cutting thin plate: manual cutting, plasma cutting and laser cutting. The thermal affected zone, cutting speed and concentration of heat source of these methods are all different, and the residual stress caused to thin plate is also different. Therefore, according to the situation to choose the cutting speed, thermal effect of small cutting process.

 Welding method and notice of stainless steel sheet

 3. The welding method has the most obvious influence on the welding stress and welding deformation of sheet metal, so it is necessary to choose the welding process with fast welding cladding, as few welding passes as possible and small heat input, such as gas shielded welding, laser welding and good welding joint quality.

 Welding method and notice of stainless steel sheet

 4, spot solid welding process, must pay attention to the number of welding, size and distance between welding points. The timing and sequence of spot weld are also important. Stress must be released in advance before assembly, otherwise it will lead to deformation and assembly difficulties in the later stage. Huayun vibration aging equipment is adopted for stress relief.

 Welding method and notice of stainless steel sheet

 5. The stress release or stress elimination shall be carried out timely after the welding of thin plate. Huayun vibration aging process or welding stress elimination equipment can be adopted to specifically target the stress of welding seam, and the elimination rate can reach above 80% to effectively prevent post-welding deformation and enhance the fatigue strength of welded joint.

 Welding method and notice of stainless steel sheet

 6, in the welding process can be used rigid fixation, reduce the gap of welding parts, using a small diameter electrode spot welding.

 Stainless steel sheet welding easy to burn through and deformation solution

 1. Strictly control the heat input on the welded joint and choose the appropriate welding method and process parameters (mainly including welding current, arc voltage and welding speed).

 2. Generally, a smaller nozzle is used for sheet metal welding, but we suggest to use a larger nozzle diameter as far as possible, so that the welding seam protection surface is larger, which can effectively and for a long time isolate air, so that the welding seam has a better oxidation resistance.

 3, with phi 1.5 cerium tungsten rods, grinding tip degrees more pointed, and the length of the tungsten rod out of the nozzle should be long, it will make the parent metal melt faster, which means melting temperature rise faster, the temperature will be more focused, can make us as soon as possible to the position of the need to melt the melt, and don't make more female temperature rise, such making that the internal stress of the material change in the area, also make the material deformation can also be reduced in the end.

 4. Select a reasonable welding sequence, which is especially important for controlling residual deformation of welding. For symmetrical weld structure, try to adopt symmetrical welding; Asymmetric structure, the use of a less weld first, after the welding weld more side. The deformation of the rear welding is sufficient to eliminate the deformation of the front side so as to reduce the overall deformation.

 5. The assembly size shall be precise and the interface gap shall be as small as possible. A larger gap can easily burn through or form a larger welding tumor.

 

 

 

 

 

Leave a Comment(And our MOQ is 1ton)