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MIG Brazing - MIG Brazing Conditions for Ultra High-Strength Steel Parts (1180 & 1500 MPa)
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MIG Brazing Conditions for Ultra High-Strength Steel Parts (1180 & 1500 MPa) |
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MIG brazed joint locations for ultra high-strength steel (1500 MPa/1180 MPa) parts are specified in the installation instructions of the applicable replacement procedure of the body repair manual. You must follow the conditions detailed below to ensure adequate joint strength.
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MIG brazing conditions:
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Pulsed MIG Welder Set-up for brazing | |
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Silicon bronze (0.8 mm (0.031 in) diameter) | |
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Shield gas: Argon gas 100% | |
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For details about correct welding current and voltage, refer to the equipment manufacturer’s recommendations. | |
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MIG welding/brazing: Metal inert gas welding or brazing where 100% Argon (Ar) shielding gas is used. Argon is inert and does not react with the molten weld pool or brazing operation. | |
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MIG Brazing to Structural Parts
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NOTE: To prevent decreased joint strength, don’t grind a MIG braze to a structural part.
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If a high-strength steel (1500 MPa) part is being brazed to another high-strength structural steel part (340 MPa or higher). Drill two, 8 mm (0.31 in) holes with approximately 10 mm (0.39 in) distance between them (distance between the centers of holes) for each MIG brazed joint location shown in the model specific body repair manual.
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MIG Brazing to Outer (Mild Steel) Panels
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These specifications are general guidelines and may not apply to certain areas of the body. Always check the model specific body repair manual for the correct type of MIG brazing joint. | |
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MIG brazed joints to an outer panel that are visible to the customer should be ground smooth. | |
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If a high- strength steel (1500 MPa) part is being brazed to a 270 MPa part (mild steel plate) such as an outer panel, drill one, 8 mm (0.31 in) diameter hole in the 270 MPa plate for each MIG brazed joint location shown in the model specific body repair manual.
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To ensure adequate joint strength, use a pulsed MIG welder with CuSi3 or AWS ER CuSi-A wire and the following brazing technique. This will create a capillary action in order to liquefy the MIG filler wire so that it can penetrate into the upper and lower plates: |
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Begin brazing about 5 mm (0.20 in) before the hole(s). | |
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Move the torch across the hole in a zigzag pattern as you close the hole(s). | |
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Continue brazing about 10 mm (0.39 in) past the hole(s). | |
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MIG Braze test joints should be prepared on similar materials, and destructively tested and confirmed it to ensure proper capillary action prior to performing MIG braze joints on the vehicle. For PASS/fail judgment of the destructive test, refer to the MIG Brazing Joint Inspection of the next SIE. | | | | 
