Tapered Drill Rod for Mining is a direct contact and work tools, pick brazing material, size and shape on the gas picks has remarkable effect on the productivity of pick brazing shape and length depending on the breakdown of the seam hardness, such as seam the harder the more short picks brazing, long conversely.
Soft seam with crack or the mine is using length of 300-300 - mm, hard and toughening of the seam, choose 150-150 - mm to pick brazing for the quality of different service life is an obvious difference, the reason for this is that quenching technology and material difference.