Internal grinding device for pipes and weld joints

A device for treating an interior weld joint located along an inner surface of a pipe comprising:

• a hub;
• and
• a surface modification mechanism that is rotatably coupled to the hub and includes a hollow housing, a first surface modifying tool that is disposed within the hollow housing within a first portion thereof, and a second surface modifying tool that is disposed within a second portion of the hollow housing that is opposite the first portion, the first surface modifying tool being coupled to the hollow housing with a first biasing member that is coupled between the hollow housing and the first surface modifying tool, the second surface modifying tool being coupled to the hollow housing with a second biasing member that is coupled between the hollow housing and the second surface modifying tool, each of the first surface modifying tool and the second surface modifying tool moving between an at rest retracted position and a deployed position in which each of the first surface modifying tool and the second surface modifying tool extends radially beyond a respective end of the hollow housing for contacting and grinding the interior weld joint, wherein the first and second biasing members are tuned such that rotation of the housing is translated to rotation of each of the first surface modifying tool and the second surface modifying tool and centrifugal force resulting from rotation of the first and second surface modifying tools causes the each of the first and second surface modifying tools to move from the at rest retracted position to the deployed position.