挤压铝合金管材用空心铸块外观质量提出了要求。
The exterior quality of the hollow billets for indirect tube extrusion is presented.
用铝合金管材制作散热器须进行扩口加工，其间往往会因为管材端部出现裂口而报废。
When we use the aluminium alloy pipe to make heat exchanger, we must use expanding. During that process the pipes usually become useless because of the end crack.
用铝合金管材制作散热器须进行扩口加工，其间往往会因为管材端部出现裂口而报废。
When we use the aluminium alloy pipe to make heat exchanger, we must use expanding.
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