Pipeline circumferential weld defect repairing method
A defect repairing and girth weld technology, which is applied in the direction of tubular objects, welding equipment, auxiliary welding equipment, etc., can solve the problems of adding simulated girth welding and precise control of front shielding gas flow, and low pass rate of one-time welding of girth welds. To achieve the effect of solving the low pass rate of one-time welding and improving the pass rate
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Embodiment 1
[0021] Example 1, a pipeline of a scroll engine and a tube joint of the pipe joint is Z10cNT1811, a specification is φ16 × 0.8, and the weld is un welded. It is repaired by ring welding method, and it is necessary to ensure that the surface of the joint is not allowed. Cracks, "C" type bite, recess, weld width does not exceed 1.5 times, uniformity does not exceed 0.16mm, no cracks inside the weld, unfelt and unmissive, weld is not allowed There is a leak.
[0022] The specific implementation steps include:
[0023] Step 1, the electrode is configured to shape the electrode, and the electrode end portion is made figure 1 The shape shown is prohibited from manually grinding the electrode; the electrode front end is repaired as a cone, the tapered angle α = 30 °, the tip diameter of the cone is D, the bottom electrode diameter is D, D and D are roughly The relationship should meet D = D / 3;
[0024] Step 2, oxide removal: Welding the pipeline ring weld by the austenitic stainless st...
Embodiment 2
[0030] Example 2, a pipeline of the scroll engine and the base material of the tube joint is Z10cNT1811, the specification is φ20 × 0.8, and the weld is not welded, and the ring welding method is repaired, the repair requirements are: welding rear joint surface Cracks, "C" type, depressions, weld width, no more than 1.5 times, uniformity does not exceed 0.16mm, no cracks inside the weld, not fused and unmopulated, weld Leakage is not allowed.
[0031] The specific implementation steps include:
[0032] Step, the electrode is modified: the electrode is molded by the electrode grinding machine, the front end of the obtained electrode is a cone, the cone angle α = 30 °, the tip diameter of the cone is D, the bottom end electrode diameter is D, D and D's roughly relationship should meet D = D / 3;
[0033] Step 2, oxide removal: Welding the pipeline ring weld by the austenitic stainless steel wire to remove surface oxide, while the weld width is 4.2mm to 4.3 mm;
[0034] Step 3, the s...
Embodiment 3
[0039] Example 3, a tube of a type of scroll engine and a pipe joint of the pipe joint is Z10cNT1811, a specification φ6 × 0.8, and the weld is un welded. The ring welding method is repaired, the repair requirements are: welding rear joint surface Cracks, "C" type, depressions, weld width, no more than 1.5 times, uniformity does not exceed 0.16mm, no cracks inside the weld, not fused and unmopulated, weld Leakage is not allowed.
[0040] The specific implementation steps include:
[0041]Step, the electrode is modified: the electrode is molded by the electrode grinding machine, the front end of the obtained electrode is a cone, the cone angle α = 30 °, the tip diameter of the cone is D, the bottom end electrode diameter is D, D and D's roughly relationship should meet D = D / 3;
[0042] Step 2, oxide removal: Welding the pipeline ring weld by austenitic stainless steel wire, remove surface oxide, while the weld width is 4.0 mm to 4.1 mm;
[0043] Step 3, the surface of the pipeli...
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