Titanium Clad Steel Plate For Rectors

2.1 Optimize plate arrangement and reasonable material use

The equipment has large diameter, long length, many nozzles, and is made of titanium steel composite plates. The joint design is relatively complex. Especially for the equipment with trays inside, the layout of plates must be accurately optimized before the equipment forecasts the material purchase plan, and the material must be reasonably reported to avoid adverse joints. Only in this way can the reasonable structure be adopted to avoid quality hazards and save manufacturing costs.

2.2 Assurance measures for composite plate equipment and materials shall ensure the manufacturing quality of large titanium steel composite plate equipment. The key is to ensure the bonding rate and bonding strength of large plate composite plate. The large plate barrel and head titanium steel composite plate used by these equipment are explosive composite. According to GB8547-8, the titanium steel composite plate is manufactured and accepted as Grade B2. Domestic experienced processing manufacturers are selected for explosive composite, and the quality of titanium clad layer and steel base material is strictly controlled, Control every process of explosive recombination. R and PT inspection was carried out on the splicing weld before the explosion of titanium clad layer, and there was no excessive defect.

2.3 Pressing and splicing of large diameter head

Large diameter of equipment ‚ The head cannot be pressed as a whole ‚ It can only be pressed and spliced. Strict technological measures shall be adopted for melon petal pressing and splicing of titanium steel composite plate head ‚ Can better guarantee the quality. first ‚ Precise plate arrangement ‚ Control melon petal size ‚ Accurate blanking; secondly ‚ To control the pressing shape of melon petals ‚ Easy to pair ‚ Control group alignment misalignment ‚ Mould and process for pressing shall be strictly required ‚ Strictly check the shape and size of the mold ‚ The pressing process of titanium steel composite plate shall be strictly formulated. It is necessary to ensure the pressed shape and size of melon petals ‚ And prevent the separation of the base layer ‚ It is more important to prevent oxidation pollution on the surface of titanium cladding; again ‚ Ensure the quality of splicing and assembly ‚ The assembly of large diameter titanium steel composite plate melon flap head is difficult ‚ The key is to control the amount of misalignment. The company selects experienced technical workers ‚ Formulate feasible process measures ‚ Make tooling mould to better ensure these large diameter titanium steel composite plate melon valve heads.

2.4 Large-diameter thin-wall cylinder rolling This batch of equipment has a large cylinder diameter and a wall thickness of 28+3mm), which is difficult to roll. In order to ensure the smooth rolling of the equipment barrel, measures should be taken in the process. First of all, the processing of the end radian of the longitudinal seam of the cylinder is generally made by pre-rolling or pressing the radian tooling. However, the processing of the end radian of the longitudinal seam of the titanium steel composite plate cylinder is easy to cause the base layer to detach, affecting the processing quality of the next process. The rolling or pressing process of the end radian should adopt a large amount of pressing, and less repeated rolling or pressing at the same part, which is beneficial to avoid the reduction of the strength of the base layer at this part and prevent the base layer from separating; Secondly, the roundness of the diameter dimension of the cylinder should be ensured for the rolling of the thin-walled cylinder of the large-diameter titanium steel composite plate. Due to the large diameter, long length and large number of cylinders of the equipment, the diameter and size of each cylinder should be controlled and the roundness should be guaranteed as much as possible. During the rolling process, the control of the rolling machine, the cooperation of the crane, the production and reasonable use of the tooling should be operated by the technicians who have experience in the processing of titanium steel composite plates.

 

2.5 Control of barrel ovality Due to the large barrel diameter, long length, thin barrel wall, poor rigidity and heavy self-weight of the equipment, as well as the multi-layer trays in the barrel, it is difficult to control the ovality of the equipment barrel, and reasonable process must be adopted to ensure that the equipment ovality meets the requirements. First of all, when the cylinder section is assembled with the cylinder section, the reasonable tooling and process shall be adopted to control its ovality and ensure its straightness; Secondly, the proper rigid support shall be designed and welded at the reasonable position of the external base of the equipment barrel; Thirdly, when assembling and welding the tray support in the equipment, the proper orientation shall be selected and special tooling shall be made to ensure the assembling and welding size of the tray support.

2.6 The reasonable setting of the leak detection nozzle is that titanium and steel cannot be welded together, which leads to the particularity of the structural design of the weld joint of the titanium steel clad plate equipment. In order to detect the leakage of the titanium clad strip weld in time, so as not to cause serious corrosion of the steel base and cause safety accidents to the equipment, the leak detection nozzle must be reasonably set on the weld joint of the steel base. According to the characteristics of large titanium steel clad plate equipment, leak detection nozzles shall be set on each longitudinal and circumferential weld, and the leak detection channel of each leak detection nozzle shall be relatively independent to facilitate targeted weld detection after the leak detection nozzle leaks.

3.1 Welding of steel base

The welding quantity of steel base of large titanium steel clad plate equipment is large, and the groove assembly and quality assurance are difficult. Generally, the welding process of the steel base layer is that the inner side of the cylinder is first welded with manual welding rod, and the outer side is welded with submerged arc welding or manual welding rod, and the matching welding materials are selected. In order to avoid the reduction of the bonding strength of the base and cladding layer near the weld joint due to the influence of the welding thermal cycle, the welding of the steel base layer at the side of the inner layer of the cylinder should adopt the small heat input process, multi-layer and multi-pass welding, and control the interlayer temperature; The groove size and the tear size of the titanium clad layer shall be controlled to prevent the deposited metal from approaching or fusing the titanium clad layer when welding the steel base layer in the cylinder. In addition, in order to strictly prevent the titanium cladding near the joint from being polluted during the welding of the steel base in the cylinder, the surface of the titanium cladding near the joint must be protected during welding.

3.2 The structure of the butt joint of the welded titanium steel clad plate equipment of titanium stick is generally shown in Figure 5. Before welding the titanium stick, the dirt and moisture on the surface of the titanium clad layer and the welding area of the titanium stick must be strictly cleaned. First, the surface oxide film is mechanically polished, and then the dirt is cleaned with silk cloth dipped with acetone. Manual argon tungsten arc welding is adopted, which is welded in layers, and the first layer is less filled with wire to ensure the penetration of welding fillet; The second layer shall be welded with filler wire to ensure the weld leg height and strength. During welding, the front and back sides shall be protected by pure argon. The purity of argon shall not be less than 99.99%. The interpass temperature shall be controlled to be less than 60 ℃. Welding with small heat input shall be used as far as possible to prevent the bonding strength of the base layer of the welding area from being affected by the welding thermal cycle.