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  13. Very few people know, the secret of the welder cuts round pipe 90 degrees in three directions

    Very few people know, the secret of the welder cuts round pipe 90 degrees in three directions

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  14. Not all know, the secret of the welder in welding thin square tube ( t-joint)

    Not all know, the secret of the welder in welding thin square tube ( t-joint)

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