Crack happens on the bottom part of the product when tensile force is given more than low yield point.

  Application of technology: aluminum circle, plate, sheet

Technical guidance about 40 quality problems on the board manufacturing process.

  Melting - casting - homogeneity -rolling - annealing.

  Bubble, coarse grain size, include, oxide, roll crown, crack, ear occurring, Macro structure,  etching etc.