Improved novel welding preheating device for storage tank
By using a single combustible gas inlet and an air-assisted siphon heating device, the problem of poor adaptability of existing preheating devices is solved, achieving rapid, safe, and low-cost metal preheating, avoiding welding cracks, and improving welding quality and safety.
Patent Information
- Application Number
- CN202423156142.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-11-21
- Estimated Expiration
- 2034-12-20
AI Technical Summary
Existing welding preheating devices are difficult to achieve efficient, simple, multifunctional and adaptable metal preheating, resulting in frequent welding cracks and affecting welding quality and safety.
It adopts a single combustible gas inlet combined with air-assisted combustion, generates high-speed gas through throttling via a small orifice, and achieves heating by utilizing the siphon effect. It is designed as an adjustable closed main tube and siphon tube structure.
It achieves rapid, safe, and low-cost metal preheating, avoids welding cracks, adapts to different workpiece shapes and materials, and improves welding quality and safety.
Smart Images
Figure CN223572274U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The device relates to a device for preventing welding cracks and continuously heating in a welding process, in particular to an improved welding preheating device for storage tanks. BACKGROUND
[0002] Welding cracks are extremely serious defects in the welding process of metals. The root cause of the welding cracks is that the metal is unevenly heated during welding, which causes internal stress concentration. When the stress exceeds the strength limit of the metal itself, cracks are formed. The harm of the welding cracks cannot be underestimated. The welding cracks not only greatly weaken the strength, toughness and sealing property of the welded joint, leading to the decrease of the load bearing capacity of the welded structure, but also cause the sudden fracture of the welded structure in extreme cases, resulting in serious safety accidents and huge losses of life and property. Meanwhile, the existence of the welding cracks inevitably leads to the increase of the product rejection rate, the increase of the waste of raw materials, the increase of the cost of rework and the production cycle, and the serious influence on the economic benefits and market competitiveness of enterprises.
[0003] At present, the common means for preventing welding cracks include preheating before welding, strictly controlling welding process parameters and post-weld heat treatment. However, the traditional preheating method has many disadvantages. For example, when the flame spray gun is used for preheating, it is difficult to accurately control the heating temperature and uniformity, and local metal heating is insufficient, which cannot effectively eliminate stress concentration. Although the electric heating pad preheating is relatively stable, it is difficult to fit for complex shapes and large metal workpieces, and the preheating effect is greatly reduced. In addition, the existing preheating device is difficult to manufacture according to different metal materials, workpiece shapes and sizes and welding process requirements, and has high manufacturing cost, long cycle and serious material waste. Under the demand of modern large-scale and high-precision metal welding production, an efficient, simple, multifunctional and low-cost metal preheating device is urgently needed to solve the problem of welding cracks and promote the metal welding technology to a new height. SUMMARY
[0004] In order to solve the above problems, the device provides a device for preventing welding cracks and continuously heating in a welding process, in particular to an improved welding preheating device for storage tanks. The traditional heating device usually adopts a double-inlet channel, that is, a combustible gas inlet channel and a combustion-supporting gas inlet channel. However, the device only adopts a single combustible gas inlet channel and uses air combustion-supporting mode to realize the heating function. The specific principle is to generate high-speed gas by using small hole throttling principle, and to introduce air combustion-supporting by using siphon effect generated when high-speed gas passes through the pipe.
[0005] The device is realized by the following technical solutions:
[0006] The utility model provides a kind of improved novel welding preheating device for storage tank, including air inlet nozzle, air inlet pipe and main pipe being communicated with each other;The main pipe is uniformly provided with air hole, and the air hole is installed with siphon pipe, the diameter of the siphon pipe is greater than the diameter of the main pipe, and the gap for air entering is left between the siphon pipe and the main pipe.
[0007] The siphon pipe and the main pipe are connected by spot welding.
[0008] The main pipe is closed mouth-shaped structure.
[0009] The main pipe is closed ring structure.
[0010] The main pipe has a whole arc, and the arc corresponds to the arc of the welding part.
[0011] The diameter of the air hole is 0.8-1mm.
[0012] The diameter of the main pipe is 25mm, and the thickness is 2.5mm;The diameter of the siphon pipe is 32mm, and the thickness is 2.5mm.
[0013] The utility model has the advantages that: the device of the utility model adopts a unique concept, and heating function can be realized by single air inlet, without inputting combustion-supporting oxygen, and the device is simple to process, can be processed by waste materials, and can be quickly processed into various shapes according to the type of workpiece to be heated. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 The utility model structural schematic diagram is shown in the drawing.
[0015] Figure 2 : Figure 1 Side view.
[0016] Figure 3 : Figure 1 A-A view. DETAILED DESCRIPTION
[0017] The utility model is further described below in combination with the drawings and examples. When the description relates to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all the embodiments consistent with the utility model. On the contrary, they are only examples of devices consistent with some aspects of the utility model as detailed in the appended claims.
[0018] The utility model relates to a kind of improved new welding preheating device for storage tank, including mutually communicating gas inlet nozzle 1, gas inlet pipe 2 and main pipe 3;The main pipe 3 is uniformly provided with air hole, and air hole is equipped with siphon 4, the diameter of siphon 4 is greater than the diameter of main pipe 3, and the gap for air entering is left between siphon 4 and main pipe 3.Siphon 4 only has two ends with main pipe and is fixed by spot welding, and full welding is not needed.The main pipe 3 is closed mouth-shaped structure, alternatively, the main pipe 3 can also be closed annular structure.The main pipe 3 has overall arc, and the arc corresponds to the arc of the piece to be welded.Preferably, the diameter of air hole is 0.8-1mm, the diameter of main pipe 3 is 25mm, and the thickness is 2.5mm;The diameter of siphon 4 is 32mm, and the thickness is 2.5mm.
[0019] Specific use: combustible gas is passed by gas inlet nozzle 1, enters main pipe 3 through gas inlet pipe 2, then can pass through 0.8-1mm air hole on main pipe, high-speed spray, enter siphon (4), air in the process is driven into the gap of the lower two ends of siphon and enters combustion-supporting purpose.The device has been applied in the welding process of the high-pressure container with the thickness of 110mm in our company at present, achieves the expected effect, and effectively avoids the generation of welding crack.
Claims
1. An improved novel welding preheating device for storage tanks characterized by: The utility model relates to a kind of air intake pipe, including intercommunication air inlet nozzle (1), air inlet pipe (2) and main pipe (3);The main pipe (3) is uniformly provided with air hole, air hole is equipped with siphon (4), the diameter of the siphon (4) is greater than the diameter of main pipe (3), and the gap for air entry is left between siphon (4) and main pipe (3).
2. An improved novel welding preheating device for storage tank as claimed in claim 1, wherein: The siphon (4) and the main pipe (3) are connected by spot welding.
3. The improved novel welding preheating device for storage tank as claimed in claim 1, wherein: The main pipe (3) is a closed mouth-shaped structure.
4. The improved novel welding preheating device for storage tank as claimed in claim 1, wherein: The main pipe (3) is a closed ring structure.
5. The improved novel welding preheating device for storage tank as claimed in claim 1, wherein: The main pipe (3) has an overall curvature corresponding to the curvature of the piece to be welded.
6. An improved novel welding preheating device for storage tank as claimed in claim 1, wherein: The air hole diameter is 0.8-1mm.
7. An improved novel welding preheating device for storage tank as claimed in claim 1, wherein: The main pipe (3) has a diameter of 25mm and a thickness of 2.5mm; the siphon (4) has a diameter of 32mm and a thickness of 2.5mm.