Preparation method for large-format sliver/steel composite board for polycrystalline silicon refining equipment

The invention provides a preparation method for a large-format sliver/steel composite board for polycrystalline silicon refining equipment. The preparation method comprises the following steps: I, carrying out automatic arc welding to form a large-format sliver board as a composite board; II, selecting a large-format steel board as a substrate; III, carrying out surface treatment; IV, laying the composite board on the top of the substrate, and arranging a supporting post between the substrate and the composite board; V, uniformly coating a protective layer on the composite board, clamping a mould, and laying explosives; VI, putting a detonator on the explosives, detonating the explosives for compounding the substrate with the composite board, thereby obtaining an exploded composite board; and VII, mechanically cutting the exploded composite board, thereby obtaining the large-format sliver/steel composite board for polycrystalline silicon refining equipment. The large-format sliver/steel composite board prepar