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三、焊接实例 1.板材对接平焊 (1)V形坡口打底焊试板尺寸见图11,钢板牌号20g。试板进行除油除锈处理后,留好装配间隙,用定位焊缝将试板两端点固,定位焊缝长10～15mm,它与正式焊缝一样,也要单面焊接双面成形。为了在焊接时使背面焊缝得到氩气保护,应预先用紫铜板制造一块垫板,沿垫板中线刨一直径为10mm左右的半圆形槽(见图12),使试板的装配间隙正对半圆形槽。焊接时,试板正
Third, the welding example 1 flat butt joint welding (1) V-grooveback welding test plate size shown in Figure 11, steel grade 20g. Test board degreasing and rust treatment, leaving the assembly gap, with the positioning of the test plate at both ends of the solid point, positioning the weld length 10 ~ 15mm, it is the same with the formal weld, but also one-sided welding double-sided forming. In order to make the back weld argon welding protection, should be pre-made copper plate with a plate along the center line planing a semi-circular groove diameter of about 10mm (see Figure 12), the test plate assembly clearance Right semicircular groove. When welding, the test plate is positive