7 Permanent weld backing bars, consumable inserts and nonconsumable insert rings are not permitted without prior written approval from SECCO.
事先没有赛科公司的书面批准，不允许有永
的支撑杆、熔化性嵌条和不
熔嵌环。
7 Permanent weld backing bars, consumable inserts and nonconsumable insert rings are not permitted without prior written approval from SECCO.
事先没有赛科公司的书面批准，不允许有永的支撑杆、熔化性嵌条和不熔嵌环。
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