1. Product description
Titanium clad steel tube plate for heat exchanger are formed by explosive welding, and the executive standard is ASTM B898-11 Standard Specification for Reactive and Refractory Metal Composite Plates. Explosive welding mainly uses the energy generated by the explosive explosion to Or plastic deformation of more than two kinds of metal materials, so that the metal interface can achieve metallurgical bonding and form a new metal composite. The explosive welding methods used in the project mainly include parallel installation.
There are two installation methods: installation method and angle installation method.
2. Product Features
(1) The shear properties, tensile properties, and impact properties of titanium/steel composite plates prepared by explosive welding in PTA project have changed after simulated post weld heat treatment at different temperatures.
(2) The results show that the tensile strength, yield strength and shear strength of titanium/steel composite plate are reduced by simulated PWHT, while the elongation and impact properties are improved after simulated PWHT.
(3) SPWHT②(615±10)℃ × 3 h+(565±15)℃ × The influence of 8.7h on the tensile properties, shear properties, and impact properties of composite plates is greater than SPWHT ① (565 ± 15) ℃ × 13 h
3. FAQ
In the process of explosive welding, the movement process of a 1mm ultra-thin cladding plate is different from that of ≥ 4mm cladding plate: first, it is not easy for the thin cladding plate to maintain its shape during the explosion process. Secondly, the quality of thin titanium clad steel tube plate for heat exchanger is relatively small, and they can quickly reach high speed; The response to detonation pressure is also very rapid, so the pressure at the interface between the gas and the cladding plate may have a moderate instantaneous drop. Therefore, the acceleration of thin plates is not as uniform as that of thick plates, resulting in the vibration and flutter of thin plates in flight. In addition, the response of the thin plate to the deceleration force is also very rapid. The duration of impact pressure obtained by clad plates depends on their thickness. The impact pressure obtained by thick clad plates lasts for a long time, which means that they do not need the high impact speed of thin plates. The thinner the clad plate is, the faster the shock wave reflected from its surface reaches the welding interface, which may lead to incomplete welding process and incomplete cooling of the interface
The interface of the cladding plate is broken due to reflection. This is due to the increase of explosive strength and the decrease of detonation velocity after adjustment. However, the production of interface melting block caused by the increase of its impact capacity is not expected to be seen in actual production, which needs a lot of practical verification and further research.
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