On the importance of jaw crusher welding

What is the impact of jaw crusher welding on the performance of the equipment? Jaw crusher in the crushing equipment is the most common, divided into casting and welding two kinds, due to the casting of certain disadvantages, so the welded jaw crusher more and more occupy the market, so the welding skills and methods are also more and more attention by customers, crushing because of the long-term receipt of the impact load effect, to improve the quality of its welding, is the welding of the production of the problem of research.

What are the possible failure problems of welding?

1. Porosity is one of the common defects in welding. The presence of porosity firstly affects the denseness of the weld (gas and water tightness), and secondly will reduce the effective area of the weld. In addition, porosity will also cause stress concentration, significantly reducing the strength and toughness of the weld, which has a significant effect on the dynamic load strength of the structure. By studying the statistics of defects on X-ray flaw negatives, people have found that most of them are porosities (about 80%), followed by slag entrapment, non-welded-through, and cracks. Therefore, to prevent porosity is to ensure the quality of the weld is the main content, but also to improve the weld a qualified rate of the main measures.

2. Cracks are the most dangerous defects in welding connections. According to the time of generation, it can be divided into hot cracks and cold cracks, the former is produced during welding, the latter is produced during or after the cooling process of the weld. In welded structures, the generation of cold cracks during use is often a very serious quality problem. The generation and development of cold cracks are generally more hidden, longer, usually does not cause the operator's attention, but once the consequences are disastrous.

3. The frame will produce a certain amount of deformation in the assembly welding process, although the deformation is not large, but after welding with other parts, the cross-sectional area of the length of the weld is not equal, so it is easy to make the post-welding stress becomes large, for the jaw crusher to withstand a large load of the equipment is very unfavorable in the work of the equipment, so in the assembly of the welding before the application of machining methods to be adjusted or corrected. During the welding process, attention should be paid to the reasonable arrangement of the welding sequence, because there are more components in the welding frame, and the number of welds is also large, if you don't pay attention to the welding sequence, it will produce a large deformation in the welding process. So before welding, you can fix the basic frame points before welding, long reinforcement plate should be used to reduce the deformation of the frame by segmental welding.

4. It is difficult to eliminate the welding stress by heat treatment because of the large size when welding the frame. So we should try to reduce the welding stress by optimizing the welding process in the welding project. Such as the lower bearing seat of the frame and the wall plate, fascia plate connection, the weld density is high, in these places should be controlled, otherwise it will affect the welding quality of the frame. Reduce the stress by reasonable welding sequence and controlling the continuous length of the weld.

It can be seen that the correct welding method of jaw crusher is related to good quality, improper welding can cause a lot of failure problems, jaw crusher frame as a supporting skeleton, bear the whole crushing production force, the strength of its frame, load-bearing capacity of the relationship between the working performance of the equipment. Therefore, before welding must develop a reasonable welding process, in addition to the correct choice of welding rod, before welding on the surface of the workpiece oil rust, moisture and other cleaning, and strict control of the drying temperature and time of the welding rod, preheating before welding, post-welding hydrogen treatment, a reasonable welding sequence and other measures, you can prevent the generation of pores and cracks, so that the production of the weld quality of the jaw crusher has been greatly improved. Welcome to click on the website customer service consulting, 24 hours online.