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内衬不锈钢复合钢管焊接过程
先焊复合层，后焊基层，流程：封焊层——打底焊——过渡层——填充层——盖面层。
First welding composite layer, then welding base, process: sealing layer - bottom welding - transition layer - filling layer - cover layer.
1）管子对焊组对时，其内壁应齐平，内壁错边量不宜超过管壁厚度的10%，且应≤2mm。
1) When the tube butt welding group is aligned, the inner wall should be even, and the staggered edge of the inner wall should not exceed 10% of the thickness of the tube wall, and should be less than 2 mm.
2）焊接时，应尽量采用多层焊，各焊层焊道的接头应尽量错开，焊道不宜太宽太厚。
2) When welding, multi-layer welding should be adopted as far as possible. The joints of each weld bead should be staggered as far as possible, and the bead should not be too wide or too thick.
3）点固焊时管内必须充氩，以保证点固焊焊缝质量。打底焊时，仰焊位置采用内填丝，立焊、平焊位置采用外填丝法进行焊接。
3) In order to ensure the quality of spot welding seam, argon must be filled in the pipe during spot welding. In bottom welding, the inner filler wire is used in the up welding position, and the outer filler wire is used in the vertical and horizontal welding positions.
4）应在坡口内引弧，禁止在非焊接部位引弧，接弧处应保证焊透与熔合，熄弧时应填满弧坑，焊接即将结束时，应减小氩气流量，防止气压过大使焊缝产生凹陷。
4) Arc ignition in groove should be prohibited in non-welded parts, penetration and fusion should be ensured at the joints, arc pits should be filled when arc extinguishing is completed, and argon flow should be reduced at the end of welding to prevent depression caused by gas pressure passing through the weld.
5）焊丝不能与钨级接触或直接深入电弧的弧柱区，防止破坏电弧的稳定和产生夹钨缺陷，焊丝端部不得退出保护区，防止焊丝氧化。
5) The welding wire can not contact with tungsten grade or go directly into the arc column area of the arc to prevent destroying the stability of the arc and producing tungsten inclusion defects. The end of the welding wire must not withdraw from the protection zone to prevent the oxidation of the welding wire.
6）道间温度应控制在150℃以下，施工中采用焊缝两侧水冷的冷却方法，即将湿毛巾裹在距焊缝80mm以外的两侧钢管上，使焊缝尽快降到150℃以下。
6) Inter-channel temperature should be controlled below 150 C. During construction, water-cooled cooling method is adopted on both sides of the weld. The wet towel is wrapped on both sides of the steel pipe beyond 80 mm from the weld, so that the weld can be reduced to below 150 C as soon as possible.
First welding composite layer, then welding base, process: sealing layer - bottom welding - transition layer - filling layer - cover layer.
1）管子对焊组对时，其内壁应齐平，内壁错边量不宜超过管壁厚度的10%，且应≤2mm。
1) When the tube butt welding group is aligned, the inner wall should be even, and the staggered edge of the inner wall should not exceed 10% of the thickness of the tube wall, and should be less than 2 mm.
2）焊接时，应尽量采用多层焊，各焊层焊道的接头应尽量错开，焊道不宜太宽太厚。
2) When welding, multi-layer welding should be adopted as far as possible. The joints of each weld bead should be staggered as far as possible, and the bead should not be too wide or too thick.
3）点固焊时管内必须充氩，以保证点固焊焊缝质量。打底焊时，仰焊位置采用内填丝，立焊、平焊位置采用外填丝法进行焊接。
3) In order to ensure the quality of spot welding seam, argon must be filled in the pipe during spot welding. In bottom welding, the inner filler wire is used in the up welding position, and the outer filler wire is used in the vertical and horizontal welding positions.
4）应在坡口内引弧，禁止在非焊接部位引弧，接弧处应保证焊透与熔合，熄弧时应填满弧坑，焊接即将结束时，应减小氩气流量，防止气压过大使焊缝产生凹陷。
4) Arc ignition in groove should be prohibited in non-welded parts, penetration and fusion should be ensured at the joints, arc pits should be filled when arc extinguishing is completed, and argon flow should be reduced at the end of welding to prevent depression caused by gas pressure passing through the weld.
5）焊丝不能与钨级接触或直接深入电弧的弧柱区，防止破坏电弧的稳定和产生夹钨缺陷，焊丝端部不得退出保护区，防止焊丝氧化。
5) The welding wire can not contact with tungsten grade or go directly into the arc column area of the arc to prevent destroying the stability of the arc and producing tungsten inclusion defects. The end of the welding wire must not withdraw from the protection zone to prevent the oxidation of the welding wire.
6）道间温度应控制在150℃以下，施工中采用焊缝两侧水冷的冷却方法，即将湿毛巾裹在距焊缝80mm以外的两侧钢管上，使焊缝尽快降到150℃以下。
6) Inter-channel temperature should be controlled below 150 C. During construction, water-cooled cooling method is adopted on both sides of the weld. The wet towel is wrapped on both sides of the steel pipe beyond 80 mm from the weld, so that the weld can be reduced to below 150 C as soon as possible.
