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Problems and Prevention of Titanium Steel Composite Plate


Problems and Prevention of Titanium Steel Composite Plate

In the production of titanium steel clad plate, the common quality problems are: clad plate defects and welding defect. The former mainly includes insufficient bonding rate, local surface cracks in the titanium and steel layers, etc; The latter mainly includes pores, cracks, incomplete welding, and slag inclusion.

Prevention and control measures

1. Composite plate defects

1) Adhere to the incoming material re inspection system, and the bonding condition of the composite board should be inspected one by one. It is a transition joint, flange, etc. For composite plates made of titanium material that do not consider strength, continuous 100% ultrasonic testing is required within a range of 50mm around the perimeter, and 200mm spacing testing is required for other areas. Other, 100% inspection.

2) When the plasticity of the composite plate is poor, it needs to be re annealed to eliminate stress, improve its performance, and prevent defects in subsequent production.

3) When bending operations are required for pulling plates such as drums and stamping heads, when the temperature is low, the bent parts should be preheated by flame to prevent bubbles or cracks.

4) When planing and drilling pipe holes, the cutting and drilling operations should be carried out from the titanium layer to the steel layer as much as possible to prevent tearing or forming cracks on the composite plate.

2. Welding defect

1) Welding the titanium layer requires argon gas with a purity of not less than 99.99% as the protective gas. In addition, welding wires are not allowed to have cracks or interlayers.

2) Carefully clean and handle the welding area of the workpiece before welding. When the ambient temperature is below 5 ℃, flame preheating should be used to preheat the base steel surface.

3) For titanium steel clad plate equipment, the titanium weld processing process is stick processing, that is, remove the titanium layer within 15mm of the edge of the clad plate. First weld the steel weld, and then use 50mm wide titanium Flat noodles to completely cover the steel weld. At the same time, weld the titanium layer and protect it with argon.

4) For micro cracks on the surface of the composite plate, the defects must be cleaned before repair welding. For small cracks, direct repair welding can be used.

5) For non bonding found during the production and inspection process, if the area is large, the material must be replaced. If the area is small, remedial measures can be taken. The non bonding area should be reinforced with titanium rivets, and the number of rivets should be minimized.