请大家翻译一下

hongda

请教下面一段英文的翻译：
Bit Brazing
Alternate and repeat the flame applications on the rear and front surfaces of the blade, as noted in Figures 5, until the blade glows in uniform dull cherry-red in the region of the cutters to be brazedAlternate. For bits 13 inch or larger it is permissible to use two individuals with torches.

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钻头硬钎焊
用火焰反复在刀身正面和反面加热，如图5所示，直到刀具刃口要钎焊的部位呈均匀的暗樱桃红色。对于13英寸或者更大的钻头，使用两个单独的吹管（各自加热）是允许的。