一、概述熔化焊接铝合金时,熔池金属的结晶系自熔合线上局部熔化的基本金属晶粒上开始,基本金属强烈的导热作用,使晶体沿着与散热方向相反的方向择优成长,由熔池边缘逐渐向中心和顶部发展。在整个结晶过程中,析出的结晶潜热、熔滴过渡时造成的断续热冲动以及各 First, an overview of the molten aluminum alloy, the molten metal from the melting of the metal crystallization of the local melting of the basic metal starting on the basic metal, the strong thermal conductivity of the basic metal so that the crystal along the cooling direction and the opposite direction of the preferred growth from The edge of the pool gradually to the center and the top of the development. Throughout the crystallization process, the crystallization of latent heat of precipitation, droplet transfer caused by intermittent thermal impulses and each