Vibratory Stress Relief (VSR)

 

Principle: Vibratory stress relief uses vibration equipment to cause resonance in the welded LR/FH40 steel components. During the resonance process, the residual stress inside the components will be redistributed and relaxed to a certain extent. This method utilizes the principle of microscopic slip and dislocation movement of metals under alternating stress. When the dynamic stress generated by vibration is superimposed on the residual stress inside the component, it will exceed the yield limit of the material in local areas, thus reducing the stress peak and achieving the purpose of eliminating welding stress.

 

Operation Process: Place the welded steel component on the worktable of the vibratory stress - relief equipment. Select appropriate exciters and vibration frequencies according to the size, shape, and weight of the component. Generally, the vibration frequency is usually between dozens of hertz and several hundred hertz. Then, adjust the vibration parameters to make the component resonate and vibrate for a period of time, usually 20 - 60 minutes. The specific time depends on the complexity of the component and the initial stress state.

 

Advantages: Compared with traditional thermal stress - relief treatment, vibratory stress - relief treatment has the advantages of energy - saving, environmental - friendliness, and high efficiency. It does not require large - scale heating equipment, and no surface defects such as oxide scale will be produced during the treatment process. Moreover, it can be carried out on - site in the workshop, without being restricted by the site, and can quickly eliminate the stress of welded components.

 

Shot Peening

 

Principle: Shot peening uses high - speed pellets (such as steel pellets, glass pellets, etc.) to impact the surface of the welded LR AH42 steel. The impact of the pellets will cause tiny plastic deformation on the metal surface, and this deformation will extend to a certain depth inside the material. During this process, the residual stress in the welding area will be relaxed and redistributed due to local plastic deformation, thus achieving the effect of reducing the stress concentration.

 

Operation Process: Place the welded steel component in the working area of the shot - peening equipment and select appropriate pellet materials and particle sizes. For example, for LR/FH40 steel, the commonly used steel pellet particle size is between 0.3 - 1.5 mm. Adjust the injection pressure and angle of the shot - peening equipment to make the pellets impact the steel surface at an appropriate speed and angle. The injection pressure is generally between 0.2 - 0.6 MPa, and the injection angle depends on the shape of the component and the part that needs to be treated. The time and intensity of shot peening can be adjusted according to the size of the welding stress and the requirements of the component. Usually, shot peening lasts for 5 - 15 minutes, and then the component is inspected and evaluated.

 

Advantages: Shot peening can not only effectively eliminate welding stress but also form a certain compressive stress layer on the steel surface, improving the anti - fatigue performance and surface hardness of the component. At the same time, this method is simple to operate, and the equipment cost is relatively low, and it is suitable for welded components of various shapes and sizes.

 

 

 

 

 

 

LR/FH40 high Strength Chemical Composition
Grade	The Element Max (%)
	C	Si	Mn	P	S	Al	N
LR/FH40	0.16	0.05	0.9-1.6	0.025	0.025	0.015
	Nb	V	Ti	Cu	Cr	Ni	Mo
	0.02-0.05	0.03-0.10	0.02	0.35	0.20	0.80	0.08

 

 

 

 

 

 

 

 

 

 

 

Why Choose Us?
We take pride in our ability to provide custom solutions for our customers' unique needs.
We analyze and compare the previous products and the current technical situation of our LR FH40 Steel Plate, and develop new technical specifications and processes.
Our customers trust us to deliver high-quality Cold-rolled Steel products on time and on budget.
We strictly implement the warm and thoughtful after-sales service, adhere to the development of good professional ethics.
We offer a wide range of Cold-rolled Steel products to meet diverse customer needs.
We adhere to the customer-centric and brand-oriented business philosophy, and continue to provide customers with reliable and excellent products and services.
Our factory is committed to upholding the highest standards of safety and quality.
All staff of our company and all departments work together to combine business management, professional technology, quantitative statistical methods and ideological education.
Our Cold-rolled Steel products are known for their durability and reliability.
Relying on the superior conditions and strong advantages of mass production, we are able to meet the different needs of our customers.

Hot Tags: lr fh40 steel plate, China lr fh40 steel plate suppliers, factory, 400HB Steel, N08904, C3501, 3005aluminum, 420 Stainless Steel, SUS316L