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,不允许有永久焊接的支、化性嵌条和不嵌环。
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,不允许有永久焊接的支、化性嵌条和不嵌环。
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