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焊接材料母材：Crl7焊接方法点焊图1点焊接头馆核区整体形貌（l）2／3（接头熔核区柱状晶垂直于试板结合面生长）图2上图局部放大。图3熔核中心区组织（400X）N3（铁素体加少量马氏体及残余奥氏体）图4熔合区组织（200X）N3（左侧为熔核区，右侧为过热区）图5母材过热区组（400
Welding material Base material: Crl7 Welding method Spot welding Figure 1 The overall shape of the spot welding joint core area (l) 2/3 (junction nugget columnar grain perpendicular to the test plate bonding surface growth) Figure 2 The above image is partially enlarged. Fig.3 N4 (ferrite plus a small amount of martensite and retained austenite) in the central zone of nugget (400X) Fig.4 Microstructure of nugget (200X) N3 (left side is nugget zone and right side is overheated zone) 5 base material overheating zone group (400