{"id":2560,"date":"2026-06-27T15:13:07","date_gmt":"2026-06-27T08:13:07","guid":{"rendered":"https:\/\/dev.wilisindomas.com\/?post_type=product&p=2560"},"modified":"2026-08-12T17:15:24","modified_gmt":"2026-08-12T10:15:24","slug":"degassing-gbf-rgb-units","status":"publish","type":"product","link":"https:\/\/dev.wilisindomas.com\/en\/product\/degassing-gbf-rgb-units\/","title":{"rendered":"Degassing – GBF\/RGB (Units)"},"content":{"rendered":"

\"\"<\/p>\n

Porosity Still a Problem? Check Your Aluminum Degassing System<\/h1>\n

Porosity is one of the most common defects in aluminum casting.<\/strong> It can affect mechanical properties, pressure tightness, surface quality, and overall casting performance.<\/p>\n

In many cases, dissolved hydrogen in molten aluminum<\/strong> contributes to gas porosity.<\/p>\n

Therefore, when porosity continues to occur despite proper melting and fluxing practices, it is worth reviewing the performance of your aluminum degassing system<\/strong>.<\/p>\n

Why Does Hydrogen Cause Porosity in Aluminum?<\/h2>\n

Molten aluminum can absorb hydrogen during melting and holding.<\/p>\n

Moisture is one of the main sources. It can enter the process through the surrounding atmosphere, charge materials, tools, and other sources of moisture.<\/p>\n

However, molten aluminum can dissolve much more hydrogen than solid aluminum.<\/p>\n

As the metal solidifies, hydrogen solubility decreases sharply. The excess hydrogen then leaves the melt and can form gas pores inside the casting.<\/p>\n

These pores can affect:<\/p>\n

    \n
  • Internal casting integrity<\/li>\n
  • Mechanical properties<\/li>\n
  • Pressure tightness<\/li>\n
  • Surface quality<\/li>\n
  • Machining performance<\/li>\n<\/ul>\n

    Therefore, effective hydrogen control plays an important role in aluminum melt treatment.<\/p>\n

    What Is Aluminum Degassing?<\/h2>\n

    Degassing<\/strong> removes dissolved hydrogen from molten aluminum before casting.<\/p>\n

    The process typically introduces an inert gas such as nitrogen or argon<\/strong> into the molten metal.<\/p>\n

    When the gas enters the melt, it forms bubbles. Dissolved hydrogen then diffuses into these bubbles. The bubbles rise to the surface and carry the hydrogen out of the molten aluminum.<\/p>\n

    As a result, effective degassing can reduce dissolved hydrogen and help control gas-related porosity.<\/p>\n

    How Does a Rotary Degassing System Work?<\/h2>\n

    A rotary degassing system<\/strong> uses a rotating shaft and impeller to disperse inert gas into molten aluminum.<\/p>\n

    The impeller breaks the incoming gas into fine bubbles and distributes them throughout the treated melt. This increases the contact area between the gas and the molten aluminum, which supports hydrogen transfer from the melt into the gas bubbles.<\/p>\n

    The basic process includes four steps:<\/p>\n

    1. Inert Gas Injection<\/h3>\n

    The system introduces nitrogen or argon through a hollow shaft.<\/p>\n

    The gas then enters the molten aluminum through the submerged rotor or impeller.<\/p>\n

    2. Gas Dispersion<\/h3>\n

    The rotating impeller breaks the gas stream into smaller bubbles.<\/p>\n

    These fine bubbles provide a larger gas\u2013metal contact area than large bubbles produced by simple bubbling methods.<\/p>\n

    3. Hydrogen Removal<\/h3>\n

    Dissolved hydrogen moves from the molten aluminum into the gas bubbles.<\/p>\n

    The bubbles then rise toward the surface and carry the hydrogen out of the melt.<\/p>\n

    4. Melt Treatment<\/h3>\n

    The rotating impeller also promotes controlled mixing of the molten metal.<\/p>\n

    As a result, the system can help distribute the treatment more evenly throughout the treated melt.<\/p>\n

    Why Choose Rotary Degassing?<\/h2>\n

    Different degassing methods are available for aluminum melt treatment.<\/p>\n

    However, rotary degassing offers several important advantages because it combines inert gas injection with controlled mechanical stirring<\/strong>.<\/p>\n

    Fine and Uniform Gas Bubbles<\/h3>\n

    The rotating impeller breaks the gas into fine bubbles and distributes them throughout the melt.<\/p>\n

    This increases the gas\u2013metal contact area and supports efficient hydrogen removal.<\/p>\n

    Controlled Melt Mixing<\/h3>\n

    The rotating impeller creates controlled movement within the molten aluminum.<\/p>\n

    Therefore, the treatment can reach more of the melt volume than a simple static gas injection approach.<\/p>\n

    Consistent Hydrogen Removal<\/h3>\n

    Properly designed rotary degassing equipment can provide controlled and repeatable melt treatment.<\/p>\n

    Process parameters such as gas flow, rotor speed, immersion depth, treatment time, and melt temperature<\/strong> influence the final degassing performance.<\/p>\n

    For this reason, operators should optimize these parameters for the specific furnace, melt volume, and alloy.<\/p>\n

    Support for Cleaner Metal<\/h3>\n

    Rotary degassing can do more than remove dissolved hydrogen.<\/p>\n

    Fine bubbles can also assist the removal of certain non-metallic inclusions by carrying them toward the surface. Industrial rotary degassing systems therefore support both hydrogen removal and melt cleaning<\/strong>.<\/p>\n

    What Are the Benefits of Effective Aluminum Degassing?<\/h2>\n

    A well-controlled degassing process can help foundries improve melt quality and reduce gas-related casting problems.<\/p>\n

    Key benefits include:<\/p>\n

      \n
    • Lower dissolved hydrogen<\/strong><\/li>\n
    • Reduced gas porosity<\/strong><\/li>\n
    • Improved casting consistency<\/strong><\/li>\n
    • Better surface quality<\/strong><\/li>\n
    • Reduced rejection rates<\/strong><\/li>\n
    • Improved melt cleanliness<\/strong><\/li>\n
    • More repeatable melt treatment<\/strong><\/li>\n<\/ul>\n

      However, degassing alone cannot eliminate every type of porosity.<\/p>\n

      Porosity can also result from shrinkage, poor feeding, oxide films, process parameters, and other casting conditions<\/strong>. Therefore, foundries should evaluate degassing as part of the overall melt and casting process.<\/p>\n

      What Makes an Effective Degassing System?<\/h2>\n

      Choosing a rotary degassing system involves more than selecting a motor and impeller.<\/p>\n

      The system should match the actual production requirements.<\/p>\n

      Important factors include:<\/p>\n

      Rotor and Impeller Design<\/h3>\n

      The impeller determines how effectively the system disperses gas into the melt.<\/p>\n

      A suitable design can produce fine and evenly distributed bubbles while maintaining controlled melt movement.<\/p>\n

      Gas Flow Control<\/h3>\n

      The system should provide stable and adjustable gas flow.<\/p>\n

      Too little gas may limit treatment effectiveness. On the other hand, excessive gas flow can create unnecessary turbulence and increase dross formation.<\/p>\n

      Rotor Speed<\/h3>\n

      Rotor speed affects bubble size, gas dispersion, and melt movement.<\/p>\n

      Therefore, the operating speed should match the furnace size, melt volume, and treatment requirements.<\/p>\n

      Shaft and Impeller Material<\/h3>\n

      The shaft and impeller operate directly inside molten aluminum.<\/p>\n

      For this reason, material selection is important for service life, contamination control, and reliable operation.<\/p>\n

      Treatment Time<\/h3>\n

      The required treatment time depends on the melt condition and process parameters.<\/p>\n

      A properly optimized system should provide sufficient treatment without unnecessarily extending the production cycle.<\/p>\n

      Rotary Degassing for Melting and Holding Furnaces<\/h2>\n

      Rotary degassing can support different aluminum melt treatment configurations.<\/p>\n

      Depending on the production setup, systems can be used with:<\/p>\n

        \n
      • Melting furnaces<\/strong><\/li>\n
      • Holding furnaces<\/strong><\/li>\n
      • Transfer ladles<\/strong><\/li>\n
      • Die-casting operations<\/strong><\/li>\n
      • Foundry melt treatment stations<\/strong><\/li>\n<\/ul>\n

        The correct configuration depends on the melt volume, production rate, furnace design, and required hydrogen level.<\/p>\n

        Monitor Degassing Performance<\/h2>\n

        Installing a degassing system is only part of an effective melt treatment strategy.<\/p>\n

        Foundries should also monitor the results.<\/p>\n

        Methods such as Density Index measurement<\/strong> or Reduced Pressure Testing can help evaluate hydrogen-related melt quality. A lower Density Index generally indicates a cleaner melt with lower gas porosity potential.<\/p>\n

        By combining controlled degassing with regular melt quality measurement<\/strong>, foundries can better understand treatment performance and identify process changes.<\/p>\n

        Improve Your Aluminum Melt Quality with Rotary Degassing<\/h2>\n

        If porosity remains a problem, the solution may not simply be adding more flux or increasing degassing time.<\/p>\n

        Instead, look at the complete melt treatment process.<\/p>\n

        A properly designed rotary degassing system<\/strong> can help remove dissolved hydrogen, improve gas dispersion, and support more consistent aluminum melt quality.<\/p>\n

        At PT Wilisindomas Indahmakmur<\/strong>, we provide rotary degassing solutions, ceramic shafts, and impellers for aluminum melting and holding applications.<\/p>\n

        Our team can help evaluate your:<\/p>\n

          \n
        • Furnace type<\/li>\n
        • Melt volume<\/li>\n
        • Alloy<\/li>\n
        • Existing degassing equipment<\/li>\n
        • Hydrogen level<\/li>\n
        • Treatment time<\/li>\n
        • Gas flow requirements<\/li>\n
        • Rotor and impeller requirements<\/li>\n<\/ul>\n

          Need Better Control of Hydrogen and Porosity?<\/h3>\n

          If your aluminum castings continue to show porosity or inconsistent melt quality, it may be time to review your degassing process.<\/p>\n

          Contact PT Wilisindomas Indahmakmur<\/strong> to discuss your aluminum melt treatment requirements and find the right rotary degassing system<\/strong> for your operation.<\/p>\n","protected":false},"excerpt":{"rendered":"

          Porosity Still a Problem? Check Your Aluminum Degassing System Porosity is one of the most common defects in aluminum casting. It can affect mechanical properties, pressure tightness, surface quality, and overall casting performance. In many cases, dissolved hydrogen in molten aluminum contributes to gas porosity. Therefore, when porosity continues to occur despite proper melting and […]<\/p>\n","protected":false},"featured_media":3340,"template":"","meta":{"_thinkrank_schema_form_data":"","_thinkrank_selected_schema_type":"","_thinkrank_additional_schemas":"","_thinkrank_canonical_url":"","_thinkrank_og_title":"","_thinkrank_og_description":"","_thinkrank_og_image":"","_thinkrank_twitter_title":"","_thinkrank_twitter_description":"","_thinkrank_twitter_image":"","_thinkrank_imported_from":"","_thinkrank_focus_keywords":[],"_thinkrank_focus_keyword":"","_thinkrank_robots_meta_enabled":0,"_thinkrank_robots_meta":"[]","_thinkrank_advanced_robots_meta":"[]","_thinkrank_primary_category":0,"ocean_front_end_style_editor":"no","ocean_post_layout":"","ocean_both_sidebars_style":"","ocean_both_sidebars_content_width":0,"ocean_both_sidebars_sidebars_width":0,"ocean_sidebar":"0","ocean_second_sidebar":"0","ocean_disable_margins":"enable","ocean_add_body_class":"","ocean_shortcode_before_top_bar":"","ocean_shortcode_after_top_bar":"","ocean_shortcode_before_header":"","ocean_shortcode_after_header":"","ocean_has_shortcode":"","ocean_shortcode_after_title":"","ocean_shortcode_before_footer_widgets":"","ocean_shortcode_after_footer_widgets":"","ocean_shortcode_before_footer_bottom":"","ocean_shortcode_after_footer_bottom":"","ocean_display_top_bar":"default","ocean_display_header":"default","ocean_header_style":"","ocean_center_header_left_menu":"0","ocean_custom_header_template":"0","ocean_custom_logo":0,"ocean_custom_retina_logo":0,"ocean_custom_logo_max_width":0,"ocean_custom_logo_tablet_max_width":0,"ocean_custom_logo_mobile_max_width":0,"ocean_custom_logo_max_height":0,"ocean_custom_logo_tablet_max_height":0,"ocean_custom_logo_mobile_max_height":0,"ocean_header_custom_menu":"0","ocean_menu_typo_font_family":"0","ocean_menu_typo_font_subset":"","ocean_menu_typo_font_size":0,"ocean_menu_typo_font_size_tablet":0,"ocean_menu_typo_font_size_mobile":0,"ocean_menu_typo_font_size_unit":"px","ocean_menu_typo_font_weight":"","ocean_menu_typo_font_weight_tablet":"","ocean_menu_typo_font_weight_mobile":"","ocean_menu_typo_transform":"","ocean_menu_typo_transform_tablet":"","ocean_menu_typo_transform_mobile":"","ocean_menu_typo_line_height":0,"ocean_menu_typo_line_height_tablet":0,"ocean_menu_typo_line_height_mobile":0,"ocean_menu_typo_line_height_unit":"","ocean_menu_typo_spacing":0,"ocean_menu_typo_spacing_tablet":0,"ocean_menu_typo_spacing_mobile":0,"ocean_menu_typo_spacing_unit":"","ocean_menu_link_color":"","ocean_menu_link_color_hover":"","ocean_menu_link_color_active":"","ocean_menu_link_background":"","ocean_menu_link_hover_background":"","ocean_menu_link_active_background":"","ocean_menu_social_links_bg":"","ocean_menu_social_hover_links_bg":"","ocean_menu_social_links_color":"","ocean_menu_social_hover_links_color":"","ocean_disable_title":"default","ocean_disable_heading":"default","ocean_post_title":"","ocean_post_subheading":"","ocean_post_title_style":"","ocean_post_title_background_color":"","ocean_post_title_background":0,"ocean_post_title_bg_image_position":"","ocean_post_title_bg_image_attachment":"","ocean_post_title_bg_image_repeat":"","ocean_post_title_bg_image_size":"","ocean_post_title_height":0,"ocean_post_title_bg_overlay":0.5,"ocean_post_title_bg_overlay_color":"","ocean_disable_breadcrumbs":"default","ocean_breadcrumbs_color":"","ocean_breadcrumbs_separator_color":"","ocean_breadcrumbs_links_color":"","ocean_breadcrumbs_links_hover_color":"","ocean_display_footer_widgets":"default","ocean_display_footer_bottom":"default","ocean_custom_footer_template":"0"},"product_brand":[24,29,37],"product_cat":[134,117],"product_tag":[],"class_list":["post-2560","product","type-product","status-publish","has-post-thumbnail","product_brand-japan-metals-chemicals","product_brand-nippon-crucible","product_brand-tyk-corporation","product_cat-degasser","product_cat-melt-tratment","entry","has-media","first","instock","shipping-taxable","product-type-simple","col","span_1_of_4","owp-content-center","item-entry","owp-thumbs-layout-horizontal","owp-btn-normal","owp-tabs-layout-section"],"yoast_head":"\nDegassing - GBF\/RGB (Units) - PT Wilisindomas Indahmakmur<\/title>\n<meta name=\"description\" content=\"Improve aluminum melt quality with a rotary degassing system. 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