Penetration Welding

discussion concerning fastening 4130 chromoly steel on web forums and discussion boards. however apart from all the questions about pre-heating, filler metals, and conductor sort and size, Weld What concerning testing?
How does one recognize you're obtaining enough penetration in your welds. The short answer is-you cannot. you'll ne'er be completely positive you succeed the proper quantity on some weld penetration welds while not damaging the slicing and dicing and metallographic testing. however the nice news is that you simply is pretty darn positive.
By running the take a look at welds victimisation a similar actual material thickness and joint style, so by following the procedures that letter, you'll be pretty darn positive that you simply area unit sensible welds.

The following is the basic procedure to test the welds on the chromoly steel 4130:
- Determine the different weld configurations with which you need to test
- Prepare a weld joint with the exact same way as you would for production welds.
- Weld joint test and write down all the settings such as heat if used, the electrical current, electrode type and size, filler metal type and size etc.
- After the test welds and cool completely, specify multiple locations to examine the cross sections
- Part of the test welds using a slitting wheel.
- Poland weld test section ranging from 180 grit silicon carbide coarse, then 240 320, and finally 400 grit paper.
- Swap with acid and muriatic Q-tip as used in the pool (to follow all the recommendations listed on the MSDS for the safety of acid)
- Quickly rinse with baking soda and water solution to neutralize
- Check the welds using a 10x power
If the penetration is suitable, you currently have a fastening procedure for fastening 4130 chromoly is well-tried. If this procedure is followed and {also the} welds were also examined visually, you'll be pretty darn positive you've got adequate penetration and weld quality.

Laser Welding

Laser welding of metals has significant advantages over traditional welding methods such as arc, TIG, and plasma welding processes. When weighing these advantages, consideration must be given to factors such as material composition, overall part size and configuration, manufacturing environment, weld quality & precision, processing time requirements, and processing cost requirements. Solid state lasers (such as Nd:YAG) are most often used for low to moderate power applications.

(Tech Note: U.S. Laser Corp 'Welding Article')
   

US Laser offers an assortment of both traditional Pulsed and Continuous-Wave (CW) lasers tailored for a variety of applications. Typically, Pulsed lasers are employed for Lap (penetration) welding requirements, whereas CW Lasers are used when Seam (Butt) welding is required. There are a few requirements in which a Q-switched laser may be applicable. However, review of individual customer requirement is recommended to ensure the proper laser is selected for the intended application.

In its simplest form, US Laser can provide a stand alone laser system for OEM applications. In this configuration, the laser head and associated optics are mounted on an optical rail, which is connected to a separate power supply / cooling cabinet by means of electrical cables and cooling lines. A beam delivery system (viewing and focusing module) can be incorporated as a means of directing the laser output to the work-piece. Fiber-optic beam delivery, conventional fixed beam delivery, and Galvanometer based (scanning) beam delivery systems are available depending upon the given application.

   

Lamp-Pumped Lasers

US Laser lamp-pumped Nd:YAG lasers employ the use of high-efficiency, long-life krypton arc-lamps to excite a solid-state Nd:YAG laser rod located within the laser cavity. The configuration of the cavity is optimized to provide high wall-plug efficiency and stable operation. Both fundamental TEM00 and multimode output modes are available. US Laser offers lamp-pumped lasers in single and multi-head configurations, with output powers ranging from several watts to 2400 watts average CW output power (link to US Laser CW systems) , up to 200 Watts average AO Q-switched output power, (link to US Laser QS systems) and up to 400 Watts average Pulsed output power. (link to US Laser Pulsed systems)

Diode-Pumped Lasers

Unlike their lamp pumped counterparts, Diode Pumped Lasers use high efficiency, long life solid state diodes as their pump source. Because of the excellent beam quality, US Laser Diode-Pumped Lasers can generally be focused to smaller spot sizes, and may be suitable for various low power welding applications. US Laser offers CW & AO Q-switched lasers in TEM 00 and multimode operation with output powers from several to 100 Watts, though higher laser output configurations are available as required on a custom basis. (link to US Laser Diode-Pumped systems)

Custom, Turnkey Laser Systems

US Laser offers custom, automated turnkey laser systems for laser welding applications. The 4000 Series Industrial Laser Systems are designed to perform demanding, precision laser processing tasks in a production environment. The Nd YAG Laser System combines accuracy and precision with stability and ruggedness for applications such as welding. (link to US Laser Machining systems) In addition, we offer several integrated cabinet laser systems which are designed for high output CW laser operation using fiber-optic beam delivery, and interfaced to a customer supplied PLC. link to US 408-2 and 408-4 CW systems)

Laser welding and laser soldering

Laser welding and laser soldering

The laser beam provides a variety of ways to join metals: it can join workpieces at the surface or produce deep welds. It can be combined with conventional welding methods and, additionally, be used for soldering.
Laserschweißen von Dickblech.
Even when seam welding with continuous laser beams, the heat-affected zones and the complete heating of the component are still considerably less than with arc or plasma welding. The supply of energy can be well monitored, regulated and maintained or precisely controlled.

Materials with a high melting point as well as high heat conductivity can be welded using a laser. Due to the small amount of molten material and the short, controllable melting period, some materials can be combined, which otherwise could not be welded. Filler materials can be used, if needed. Even when seam welding with continuous laser beams, the heat-affected zones and the complete heating of the component are still considerably less than with arc or plasma welding. The supply of energy can be well monitored, regulated and maintained or precisely controlled.
In soldering, the mating parts are joined by a filler material, or solder. The surface of the solder seam is smooth and clean, forming a nicely curved transition to the workpiece. Since solder seams do not require finishing, they are often used in the automotive industry for making body parts such as trunk lids or car roofs.

Building shapes out of powder and wire

Building shapes out of powder and wire

Deposition welding is a generating process that is applied for surface finishing as well as repairing or modifying existing components. Depending on the task at hand, either manual or automated laser deposition welding is used.
Manual laser deposition welding: the laser beam melts the filler wire and deposits material on the workpiece surface.
Manual laser deposition welding: the laser beam melts the filler wire and deposits material on the workpiece surface.

Manual laser deposition welding

In the case of manual deposition welding, the welder guides the filler material "by hand" to the area to be welded. A thin wire with a diameter between 0.15 and 0.6 millimeters is primarily used as filler material in this process. The laser beam melts the wire. The molten material forms a strong bond with the substrate, which is also melted, and then solidifies, leaving behind a small raised area. The welder continues in this fashion, spot by spot, line by line, and layer by layer, until the desired shape is achieved. Argon shields the work process from the ambient air. Finally, the part is restored to its original shape by grinding, lathing, milling, EDM etc.
When coating the surface, several powder coatings are either melted onto one another or next to one another, as required. The individual welding paths must precisely overlap in order to achieve a texture that is free from errors.
When coating the surface, several powder coatings are either melted onto one another or next to one another, as required. The individual welding paths must precisely overlap in order to achieve a texture that is free from errors.

Automated laser deposition welding

In the case of automated deposition welding, the machine guides the filler material to the area to be welded. Although the material can also be a wire, this process primarily uses metal powders. Metal powder is applied in layers to a base material and fused to the base material and is fused to it without pores or cracks. The metal powder forms a high-tensile weld joint with the surface. After cooling, a metal layer develops that can be machined mechanically. A strength of this process is that it can be used to build up a number of similar or differing metal layers.