In recent years, with the continuous advancement of large-scale urbanization, the output and social ownership of concrete mixers have doubled year by year, but the resulting quality problems have also emerged one after another,Mixer truck racewayThe problem of weld cracking is a typical example. In order to improve the comprehensive utilization rate and use efficiency of concrete mixer truck to a great extent, our company has carried out a detailed analysis of the main reasons for the cracking of the raceway weld of the mixer truck, and put forward the corresponding solutions, hoping to provide some valuable reference for the improvement of relevant professionals in the future.

In the use of mixing truck raceway mixing concrete, oftenMixer truck racewayWeld cracking. below to introduce.

Application of 1. Mixer Truck Raceway Weld Cracking Analysis in Raceway

In-service concrete mixer truck raceways are often subject to weld cracking. The main reasons are as follows:

　　1.Mixer truck racewayAnd the fuel tank is made of different materials, the carbon content is very different, there is no heat treatment after welding, resulting in cracks near the raceway side. Solution: Change the material of the raceway. For example, when the water tank is made of Q345 steel plate, the raceway is also made of Q345 material accordingly. In this way, the raceway has the same weldability as the tank material.

2. The radial height of the raceway section of the mixer truck is small, the deflection is small, or the stiffness of the mixing tank is low, and it is easy to produce elastic deformation during use, so that the weld between the mixing tank and the raceway is constantly subjected to alternating stress, resulting in cracking. The crack is on the side near the rear of the tank. Solution: Increase the radial height of the concrete mixer truck raceway segment.

3. The material thickness of the roller of the mixer truck and the tank barrel is very different, and the welding process is not well controlled, which is easy to cause the weld or the tank body to crack. For example, when the welding current is too large, in the tank barrel, there will be undercut phenomenon, which will easily lead to the cracking of the tank skin; or when the weld is off-center, the fusion surface between the raceway and the fuel tank is too large or too small, and the uneven stress causes the weld or the fuel tank to crack. Solution: Control the welding form, process parameters and welding position, preferably by submerged arc welding process.

II.Mixer truck racewayEnhanced Programme

In addition to the above-mentioned conventional methods to solve the cracking of the raceway weld of the concrete mixer truck, we can also consider from another aspect, that is, to strengthen the connection between the raceway of the concrete mixer truck and the tank barrel, that is, on the inner wall of the tank The addition of a reinforcing ring can effectively improve the strength and rigidity of the raceway and the storage tank, effectively disperse the concentrated load of the raceway and the storage tank, and the storage tank, and the storage tank, and reduceMixer truck racewayAccidents of weld cracking and tank wall cracking at the connection between storage tank and raceway.