Do You Know The Basics Of Titanium Welding?

1. What is welding material? What is included?

A: Welding materials include welding rods, wires, fluxes, gases, electrodes, gaskets and so on.

2,What is welding wire?

A: As a filler metal when welding, also used to conduct electricity wire - known as welding wire. Divided into solid wire and flux-cored wire. Commonly used solid wire model: ER50-6 (brand: H08Mn2SiA).

3, why is the impact toughness of MAG welded joints higher than CO2 welded joints?

A: MAG welding, the reaction gas is only 20%, the transition coefficient of the alloying elements in the wire is high, the impact toughness of the weld is high.CO2 welding reactive gas 100%, the wire in the manganese, silicon alloying elements common deoxidation. The transition coefficient of alloying elements is slightly lower, the impact toughness of the weld is not as good as MAG welding. For example, Tangshan Shensteel MG-51T wire (equivalent to ER50-6) its room temperature impact toughness value: MAG: 160J; carbon dioxide: 110 Joule.
4, what is flux-cored wire?

A: by thin steel strip drawn into a round steel pipe and filled with a certain amount of powder wire.

5, flux-cored wire why CO2 gas protection?

A: flux-cored wire according to the protection of two kinds: flux-cored gas-protected wire and flux-cored self-protection wire. Flux-cored gas-protected wire is generally protected by CO2 gas, belonging to the gas and slag in the form of joint protection, weld molding is good, high mechanical properties.

6, why flux-cored wire weld surface appears jagged?

A: Because flux-cored wire is made of thin steel strip rolled into a tubular wire, so it belongs to the seam wire; moisture in the air will invade the core through the gap, the flux is wet (can not be dried), resulting in jagged pores in the weld.

7. Why is there a technical requirement for the purity of CO2 gas?

A: Generally speaking, CO2 gas is a by-product of chemical production. The purity is only about 99.6%. Contains traces of impurities and moisture, which can cause weld porosity and other defects. Welding of important products must use CO2 purity ≥ 99.8%, less weld porosity, low hydrogen content, good anti-cracking properties of the gas.

8, why the purity of argon gas has higher technical requirements?

A: There are three types of argon gas on the market: argon (purity 99.6% or so), pure argon (purity 99.9% or so), high purity argon (purity 99.99%), the first two can be welded to carbon and stainless steel steel; aluminum alloys, titanium and titanium alloys and other non-ferrous metals must be used to high purity argon gas; weld and heat-affected zone can not be welded.

9. Why are there various sizes of TIG welding nozzles?

A: There are five kinds of nozzles from 4 to 8, and nozzles from 4 to 5 can be used for welding carbon steel. Welding stainless steel and aluminum and aluminum alloys should be used 6-7 nozzle to enhance the protection of the weld and heat-affected zone. Welding titanium and titanium alloys and other non-ferrous metals should be used larger 7-8 nozzle to prevent oxidation and heat-affected zone is oxidized.

10. What is an acidic electrode?

A: The electrode contains a large number of acidic oxides electrodes, such as junction 422 (E4303), junction 502 (E5003) and other AC and DC electrodes.

11. What is an alkaline electrode?

A: The electrode contains a large number of alkaline oxides and fluorine-containing electrodes, such as Junction 507 (E5015), Junction 506 (E5016) and other electrodes.

12. What is cellulose-based (direct welding) electrodes?

A: The electrode contains a large number of organic electrodes, the use of pipe and sheet structure vertical welding.

<1> For example, E6010 (equivalent to E4310, J425G) is suitable for priming, hot welding, filler welding.

<2>E8010 (equivalent to E5511, J555) is suitable for hot welding, filler welding, cover welding.

Surface welding is generally used under the low hydrogen electrode; E7048 (equivalent to J506X) has a neat and beautiful appearance.

13, why strictly dry welding rod before welding?

A: Welding electrodes are prone to moisture absorption and deterioration of process performance, resulting in arc instability, increased spatter, porosity, cracks and other defects. Therefore, the electrode must be strictly dried before use. General acid electrode drying temperature of 150-200 ℃, time 1 hour; alkaline electrode drying temperature of 350-400 ℃, time 1 - 2 hours, after drying placed in 100 - 150 ℃ incubator. Inside, use with you.