Management of materials and environment before welding titanium composite plate tanks

To ensure the processing quality of the titanium composite plate tanks, before the processing, the materials and the environment should be protected and cleaned. The specific management measures are as follows:
I. Materials:
Each material, including welding materials, should comply with the requirements stipulated in the drawings and relevant technical standards.

2. Management of Materials:
(1) The surface of the titanium sheet and the inner layers of the composite plate should be protected by applying paper film coating to prevent contamination from dust, oil, iron ions and other impurities. Moreover, this method can also prevent the surface of the titanium material from being scratched during handling or processing.

(2) Titanium and titanium composite plates should be stored separately from other materials. The storage environment should be kept clean. At the bottom of the storage area, use clean wood to support (ensuring there are no hardware such as nails), and cover the upper part with plastic sheeting.

(3) Each handling equipment and forming equipment, such as bending machines, presses and lifting fixtures, should be cleaned. Defects such as burrs and notches that cause damage and contamination to the titanium surface should be locally ground and polished. If necessary, to protect the titanium surface from damage and contamination, appropriate covering should be applied during the use of the equipment.

(4) During welding, the titanium surface must be protected with a clean and soft cloth or felt to prevent the welded object from damaging the surface.

II. Manufacturing Environment:
The welding and assembly of titanium composite plate tanks should be carried out in a clean workshop. Welding or assembly must not be conducted in areas with iron and dust to prevent contamination by iron ions or other impurities. Rubber or other soft materials should be laid on the site to avoid damage to the titanium surface from impacts and scratches. The site should be cleaned frequently to remove debris.

2. Tools in contact with titanium should be made of titanium or aluminum. A small amount of stainless steel tools can be used, but they must be approved by the process before they can be employed.

3. Personnel working in this environment should wear clean work clothes, soft-soled shoes or rubber shoes, and keep them clean. The work clothes should be kept clean and placed in the auxiliary room of the clean workshop.

4. To verify whether the welding environment of the titanium composite plate tank meets the requirements, a phenanthroline test should be conducted before welding to eliminate the presence of iron ions.