The total area of the wires inside the tube (including the insulation coat) should not be more than 40% of the area of the internal section of the pipe.
管内导线包括绝缘层在内的总面积不应大于管子的内截面的40%。
2
A die with internal lining ceramics coat was made by using this technology. Then a semi-solid aluminum alloy forming experiment was made in the die.